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Online question and answer communities like Yahoo Answers, Quora, Stackoverflow are fun and easy way to learn from others. A Q&A site helps your online community to share knowledge. People with questions get the answers they need. They get a wide range of information from across the web. A Q&A platform empowers people to share and grow the world's knowledge. People come to ask questions about any subject, read high quality knowledge that's personalized and relevant to them, and share their own knowledge with others. This is a place to share knowledge and better understand the world.
Stack Overflow is a privately held website, the flagship site of the Stack Exchange Network, created in 2008 by Jeff Atwood and Joel Spolsky. It was created to be a more open alternative to earlier question and answer sites such as Experts-Exchange. It features questions and answers on a wide range of topics in computer programming. The website 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 and edit questions and answers in a fashion similar to a wiki or Digg. Users of Stack Overflow can earn reputation points and "badges"; for example, a person is awarded 10 reputation points for receiving an "up" vote on an answer given to a question, and can receive badges for their valued contributions, which represents a kind of gamification of the traditional Q&A site. All user-generated content is licensed under a Creative Commons Attribute-ShareAlike license. Closing questions is a main differentiation from Yahoo! Answers 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. As of April 2014 Stack Overflow has over 4,000,000 registered users, and it exceeded 10,000,000 questions in late August 2015. Based on the type of tags assigned to questions, the top eight most discussed topics on the site are: Java, JavaScript, C#, PHP, Android, jQuery, Python and HTML. Stack Overflow also