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</style><div role="note" class="hatnote navigation-not-searchable">For the general term, see <a href="Stack_overflow" title="Stack overflow">Stack overflow</a> and <a href="Stack_overflow_(disambiguation)" class="mw-disambig" title="Stack overflow (disambiguation)">Stack overflow (disambiguation)</a>. For the parent company, see <a href="Stack_Exchange" title="Stack Exchange">Stack Exchange</a>.</div>
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</style><table class="infobox vcard"><caption class="infobox-title fn org">Stack Exchange, Inc.</caption><tbody><tr><td colspan="2" class="infobox-image"><style data-mw-deduplicate="TemplateStyles:r1257397826">
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</style><div class="hlist"><ul><li>English</li><li>Spanish</li><li>Russian</li><li>Portuguese</li><li>Japanese</li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Owner</th><td class="infobox-data"><a href="Prosus" title="Prosus">Prosus</a></td></tr><tr><th scope="row" class="infobox-label">Created&nbsp;by</th><td class="infobox-data"><a href="Jeff_Atwood" title="Jeff Atwood">Jeff Atwood</a> and <a href="Joel_Spolsky" title="Joel Spolsky">Joel Spolsky</a></td></tr><tr><th scope="row" class="infobox-label">CEO</th><td class="infobox-data">Prashanth Chandrasekar</td></tr><tr><th scope="row" class="infobox-label">URL</th><td class="infobox-data url"><span class="url"><a rel="nofollow" class="external text" href="https://stackoverflow.com">stackoverflow<wbr>.com</a></span> </td></tr><tr><th scope="row" class="infobox-label">Commercial</th><td class="infobox-data">Yes</td></tr><tr><th scope="row" class="infobox-label">Registration</th><td class="infobox-data">Optional</td></tr><tr><th scope="row" class="infobox-label">Launched</th><td class="infobox-data">15&nbsp;September 2008<span style="display:none">&nbsp;(<span class="bday dtstart published updated">2008-09-15</span>)</span><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Content license</div></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">
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</style><div class="plainlist"><ul><li><a href="Creative_Commons_license" title="Creative Commons license">CC BY-SA</a> 2.5 (until April 2011)</li><li>CC BY-SA 3.0 (until May 2018)</li><li>CC BY-SA 4.0</li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Written&nbsp;in</th><td class="infobox-data"><a href="C_Sharp_(programming_language)" title="C Sharp (programming language)">C#</a></td></tr></tbody></table>
<p><b>Stack Overflow</b> is a <a href="Question-and-answer_site" class="mw-redirect" title="Question-and-answer site">question-and-answer website</a> for <a href="Computer_programmers" class="mw-redirect" title="Computer programmers">computer programmers</a>. Created in 2008 by <a href="Jeff_Atwood" title="Jeff Atwood">Jeff Atwood</a> and <a href="Joel_Spolsky" title="Joel Spolsky">Joel Spolsky</a>,<sup id="cite_ref-introducing_2-0" class="reference"><a href="#cite_note-introducing-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> it is the flagship site of the <a href="Stack_Exchange" title="Stack Exchange">Stack Exchange Network</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Stack Overflow features questions and answers on certain <a href="Computer_programming" title="Computer programming">computer programming</a> topics,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> and was created to be a more open alternative to earlier question-and-answer websites such as <a href="Experts-Exchange" class="mw-redirect" title="Experts-Exchange">Experts-Exchange</a>. The website was sold to <a href="Prosus" title="Prosus">Prosus</a>, a Netherlands-based consumer-internet conglomerate, on 2 June 2021 for $1.8 billion.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</p><p>Stack Overflow serves as a platform for users to ask and answer questions, and, through membership and active participation, to vote questions and answers up or down similar to <a href="Reddit" title="Reddit">Reddit</a> and edit questions and answers in a fashion similar to a <a href="Wiki" title="Wiki">wiki</a>.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Users of the website can earn <a href="Reputation_system" title="Reputation system">reputation points</a> and "badges"; for example, a person is awarded 10 reputation points for receiving an "up" vote on a question or an answer to a question,<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> and can receive badges for their valued contributions,<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> which represents a <a href="Gamification" title="Gamification">gamification</a> of the traditional Q&amp;A website. Users unlock new privileges with an increase in reputation like the ability to vote, comment, and even edit other people's posts.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>
</p><p>As of June&nbsp;2025, Stack Overflow has over 29 million registered users, and has received over 24 million questions and 36 million answers.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> The site and similar programming question-and-answer sites have globally mostly replaced programming books for day-to-day programming reference in the 2000s, and today are an important part of <a href="Computer_programming" title="Computer programming">computer programming</a>.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Based on the type of <a href="Tag_(metadata)" title="Tag (metadata)">tags</a> assigned to questions, the top eight most-discussed topics on the site are <a href="JavaScript" title="JavaScript">JavaScript</a>, <a href="Java_(programming_language)" title="Java (programming language)">Java</a>, <a href="C_Sharp_(programming_language)" title="C Sharp (programming language)">C#</a>, <a href="PHP" title="PHP">PHP</a>, <a href="Android_(operating_system)" title="Android (operating system)">Android</a>, <a href="Python_(programming_language)" title="Python (programming language)">Python</a>, <a href="JQuery" title="JQuery">jQuery</a>, and <a href="HTML" title="HTML">HTML</a>.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup>
</p>
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<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>
<p>The website was created by <a href="Jeff_Atwood" title="Jeff Atwood">Jeff Atwood</a> and <a href="Joel_Spolsky" title="Joel Spolsky">Joel Spolsky</a> in 2008.<sup id="cite_ref-introducing_2-1" class="reference"><a href="#cite_note-introducing-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The name for the website was chosen by voting in April 2008 by readers of <i>Coding Horror</i>, Atwood's programming blog.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> On 31 July 2008, Jeff Atwood sent out invitations encouraging his subscribers to take part in the private beta of the new website, limiting its use to those willing to test out the new software. On 15 September 2008 it was announced that the public beta version was in session and that the general public was now able to use it to seek assistance on programming related issues. The design of the Stack Overflow logo was decided by a voting process.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup>
</p><p>On 3 May 2010, it was announced that Stack Overflow had raised $6 million in venture capital from a group of investors led by <a href="Union_Square_Ventures" title="Union Square Ventures">Union Square Ventures</a>.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup>
</p><p>In 2019, Stack Overflow named Prashanth Chandrasekar as its chief executive officer and Teresa Dietrich as its chief product officer.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup>
</p><p>In June 2021, <a href="Prosus" title="Prosus">Prosus</a>, a Netherlands-based subsidiary of <a href="South_Africa" title="South Africa">South African</a> media company <a href="Naspers" title="Naspers">Naspers</a>, announced a deal to acquire Stack Overflow for $1.8 billion.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Security_breach">Security breach</h3></div>
<p>In early May 2019, an update was deployed to Stack Overflow's development version. It contained a bug which allowed an attacker to grant themselves privileges in accessing the production version of the site. Stack Overflow published on their blog that approximately 184 public network users were affected by this breach, which "could have returned IP address, names, or emails".<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="2023_controversy_over_AI-generated_content_and_moderation_strike">2023 controversy over AI-generated content and moderation strike</h3></div>
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</style><div role="note" class="hatnote navigation-not-searchable dablink excerpt-hat selfref">This section is an excerpt from <a href="Stack_Exchange#June–August_2023_moderation_strike" title="Stack Exchange">Stack Exchange § June–August 2023 moderation strike</a>.<span class="mw-editsection-like "><span class="mw-editsection-bracket">[</span><a class="external text external" href="https://en.wikipedia.org/w/index.php?title=Stack_Exchange&amp;action=edit">edit</a><span class="mw-editsection-bracket">]</span></span></div><div class="excerpt">
<p>In mid-2023, Stack Exchange made several changes regarding its policies around content generated by <a href="Artificial_intelligence" title="Artificial intelligence">artificial intelligence</a> which resulted in a strike of a portion of its volunteer moderators. The protest centered around a policy posted to moderators on May 29 stating that the use of AI-detection tools were not permitted to be used as part of moderation. In a statement, Stack Exchange confirmed that 11% of moderators had ceased content moderation in response to this policy.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> This would grow to more than 23% of all moderators on the network by June 22, including more than 70% of all Stack Overflow moderators.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup>
</p><p>The strike began with a post to Meta Stack Exchange, which raised concerns regarding the quality and accuracy of AI-generated content, and the lack of transparency from Stack Exchange surrounding this policy change.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> Moderators also stated that the version of the policy released to the public differed from the version they had received on the moderator-only forum, notably in that the public version did not include language requiring that moderators stop restricting all AI content.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup>
</p>
Negotiations between Stack Exchange and moderators resulted in new policies allowing moderators to remove AI content when there is a strong indicator of GPT usage, and a commitment from the site to continue to provide data and API access. At the conclusion of negotiations, the strike ended on August 2, 2023.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup></div></div>
<div class="mw-heading mw-heading2"><h2 id="Content">Content</h2></div>
<p>Stack Overflow only accepts questions about programming that are tightly focused on a specific problem. Questions of a broader nature—or those inviting answers that are inherently a matter of opinion—are usually rejected by the site's users, and marked as closed. The sister site softwareengineering.stackexchange.com is intended to be a venue for broader queries, e.g. general questions about <a href="Software_development" title="Software development">software development</a>.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup>
</p><p>Closing questions is a main differentiation from other Q&amp;A sites like <a href="Yahoo!_Answers" class="mw-redirect" title="Yahoo! Answers">Yahoo! Answers</a> and a way to prevent low quality questions. The mechanism was overhauled in 2013; questions edited after being put "on hold" now appear in a review queue.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> Jeff Atwood stated in 2010 that duplicate questions are not seen as a problem but rather they constitute an advantage if such additional questions drive extra traffic to the site by <a href="Search_engine_optimization" title="Search engine optimization">multiplying relevant keyword hits in search engines</a>.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup>
</p><p>All <a href="User-generated_content" title="User-generated content">user-generated content</a> is licensed under <a href="Creative_Commons_license" title="Creative Commons license">Creative Commons Attribute-ShareAlike</a> license, version 2.5, 3.0, or 4.0 depending on the date the content was contributed.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Statistics">Statistics</h2></div>

<p>A 2013 study has found that 75% of users only ask one question, 65% only answer one question, and only 8% of users answer more than 5 questions.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> To empower a wider group of users to ask questions and then answer, Stack Overflow created a mentorship program resulting in users having a 50% increase in score on average.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> As of 2011, 92% of the questions were answered, in a median time of 11 minutes.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup>
</p><p>As of August&nbsp;2012, 443,000 of the 1.3 million registered users had answered at least one question, and of those, approximately 6,000 (0.46% of the total user count) had earned a reputation score greater than 5000.<sup id="cite_ref-Bosu_et_al._37-0" class="reference"><a href="#cite_note-Bosu_et_al.-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> Reputation can be gained fastest by answering questions related to tags with lower expertise density, doing so promptly (in particular being the first one to answer a question), being active during off-peak hours, and contributing to diverse areas.<sup id="cite_ref-Bosu_et_al._37-1" class="reference"><a href="#cite_note-Bosu_et_al.-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Technology">Technology</h2></div>
<p>Stack Overflow is written in <a href="C_Sharp_(programming_language)" title="C Sharp (programming language)">C#</a> using the <a href="ASP.NET_MVC" title="ASP.NET MVC">ASP.NET MVC</a> (<a href="Model%E2%80%93view%E2%80%93controller" title="Model–view–controller">Model–View–Controller</a>) framework, and <a href="Microsoft_SQL_Server" title="Microsoft SQL Server">Microsoft SQL Server</a> for the database<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> and the <a href="Dapper_ORM" title="Dapper ORM">Dapper</a> <a href="Object-relational_mapper" class="mw-redirect" title="Object-relational mapper">object-relational mapper</a> used for data access.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Unregistered users have access to most of the site's functionality, while users who sign in can gain access to more functionality, such as asking or answering a question, establishing a profile and being able to earn reputation to allow functionality like editing questions and answers without peer review or voting to close a question.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Reception">Reception</h2></div>
<p>Stack Overflow won the <a href="2020_Webby_Award" class="mw-redirect" title="2020 Webby Award">2020 Webby People's Voice Award for Community</a> in the category Web.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup>
</p><p>The site's culture has been criticized in the past for being unfriendly by one research paper, especially in the context of gender differences in participation and beginners learning computer science.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> A 2023 study by another researcher concluded that the website's new users were met with significant difficulties in obtaining help from other users in posts started by the former; an analysis from a sample of 968 posts showed that 49% experienced hurdles such as their questions being closed, receiving no response, or receiving no mention as to why their posts were being negatively scored.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup>
</p><p>A study from the <a href="University_of_Maryland" class="mw-redirect" title="University of Maryland">University of Maryland</a> found that Android developers that used only Stack Overflow as their programming resource tended to write less secure code than those who used only the official Android developer documentation from Google, while developers using only the official Android documentation tended to write significantly less functional code than those who used only Stack Overflow.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Decline">Decline</h2></div>
<p>Starting from 2023 and as of July 2025, Stack Overflow's questions have rapidly decreased due to AI-enabled solutions like ChatGPT, Deepseek and Claude AI.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
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<ul><li><a href="Askbot" title="Askbot">Askbot</a> (free engine)</li>
<li><a href="List_of_Internet_forums" title="List of Internet forums">List of Internet forums</a></li>
<li><a href="Rosetta_Code" title="Rosetta Code">Rosetta Code</a> (multi-lingual algorithms)</li></ul>
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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</ol></div></div>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
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