Wireless Application Protocol (WAP) is an open international standard for applications that use wireless communication.  Its main use is to enable access to the Internet from a cellphone or PDA (Personal Digital Assistant).

A WAP browser provides all of the basic services of a computer based web browser but simplified to operate within the restrictions of a callphone, such as its smaller view screen.  WAP sites are websites written in, or dynamically converted to, WML (Wireless Markup Language) and accessed via the WAP browser.