WAP: The Wireless Application Protocol (WAP) is an open standard for
developing wireless applications. All major players in the wireless market
collaborated to come up with a standard for extending the Web to mobile devices.
Applications for WAP-enabled devices usually are written in Wireless Markup
Language (WML), but Microsoft .NET provides a framework to deal with WML and a
higher level of abstraction to access the low-level tasks. The current version
of the Mobile Internet Toolkit takes care of generating output that complies
with the WML 1.1 specification.
Diagram of WAP Communication

Conclusion
Hope this blog help you to understand what is WAP.

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