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Yahoo! Groups is an electronic mailing list service provided by Yahoo!. Over the years, Yahoo! bought several other mailing list providers, including the popular eGroups, and combined them with Yahoo! Clubs into one system. Thus, Yahoo! Groups is now by far the most popular and well-known provider of electronic mailing list facilities.
The category tree of topics in which the groups are sorted is borrowed largely from Yahoo!'s own directory hierarchy, however some subcategories in Yahoo! Directory Such as music are so popular in Yahoo! Groups that they have their own top-level category.
As well as providing e-mail relaying and archiving facilities for the many lists it hosts, the Yahoo! Groups service provides additional functions, such as voting and calendar systems. This has helped persuade many large users to continue using the service, since these "value added" elements would be harder to provide on their own servers.