Yahoo! Messenger is the most popular instant messenger currently available, and it requires a Yahoo! account in order to be accessed.
Besides the obvious messaging functions, Yahoo! Messenger also supports file transfers, customized status messages and personalized IMVironments (the background of the chat window can be easily modified).
Furthermore, Yahoo! Messenger enables users to automatically display the name of song they are listening to as their status message, as long as they are using a compatible music player.
The functions of this application can be enhanced with additional utilities that can block its built-in ads or enable multiple instances.
Users can also install tweaks to provide integration of Yahoo! Messenger with other programs or to apply custom animated avatars.