Instant messaging client and protocol for real-time text, voice, video chat, and file sharing, with a history of declining usage due to smartphone rise.
Yahoo! Messenger (sometimes abbreviated Y!M) is an advertisement-supported instant messaging client and associated protocol provided by Yahoo!. The client was first released in 1998 and allows users to communicate in real-time through text, voice, video chat, and file sharing.
Yahoo! Messenger became extremely popular in the early 2000s, partly due to its interoperability with the MSN Messenger network and AOL Instant Messenger through a feature called IMVironments. This allowed users on different instant messaging clients to chat with one another seamlessly. At its peak around 2001, Yahoo! Messenger had over 120 million active users worldwide.
Usage of Yahoo! Messenger began to decline significantly in the late 2000s with the rising popularity of smartphones and messaging apps like WhatsApp. Features like SMS messaging and radio streaming were removed from Yahoo! Messenger in 2012. And in 2018, Yahoo! announced it would be shutting down the 20-year-old Yahoo! Messenger service to focus on its new messaging app called Yahoo! Squirrel.
Today, Yahoo! Messenger is considered abandonware. While the service is still technically active at the protocol level to support third-party chat clients, the official Yahoo! Messenger client app was shut down as of July 2018.