stackoverflow.com

Stack Overflow is a platform for users to ask and answer questions, as well as to vote questions and answers up or down in a manner similar to Reddit, and to edit questions and answers in a manner similar to a wiki. Stack Overflow had approximately 20 million registered users as of March 2022, with over 24 million questions and 35 million answers.

Users of stackoverflow.com can earn reputation points 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, and can earn badges for their valuable contributions, resembling a gamification of the traditional Q&A website. Especially, besides voting and commenting, users can even edit other people's posts.

stackoverflow.com only accepts programming queries that are narrowly focused on a specific topic. Questions of a larger nature, or those that invite replies that are essentially subjective, are typically rejected by site users and designated as closed. The top eight most discussed subjects on the site are based on the type of tags applied to questions: JavaScript, Java, C#, PHP, Android, Python, jQuery, and HTML.

In the 2000s, the site and similar programming question-and-answer sites largely supplanted programming books for day-to-day programming reference, and they remain an essential element of computer programming today.

Website's total visits: 239.2M
(Numbers as of 2023 from www.similarweb.com)