Yahoo was first formed as a web directory of web sites owned by Yahoo. It is organized into a hierarchy of categories and subcategories. Yahoo Directory now provides two ways of inclusion: Standard, which is free of charge and only accessible for non-commercial categories.
Yahoo Messenger is an instant messaging service owned by Yahoo. Its service launched on 9 March 1998 which contends with AOL instant messenger, Google Talk, ICQ and QQ. It provides some unique characteristics, for example IMvironments, custom status messages, and custom avatars.