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Stack Overflow is a question-and-answer website for computer programmers. Created in 2008 by Jeff Atwood and Joel Spolsky, it is the flagship site of the Stack Exchange network. Stack Overflow features questions and answers on certain computer programming topics, and was created to be a more open alternative to earlier question-and-answer websites such as Experts-Exchange. The website was sold to Prosus, a Netherlands-based consumer-internet conglomerate, on 2 June 2021 for US$1.8 billion.