WAP stands for Wireless Application Protocol.

More info : The de facto standard for transfering wireless web pages to cell phones and displaying them on small screens. In order to be WAP enabled, a cell phone must comprise a WAP browser capable of reading and displaying web pages coded in WML, one of the wireless equivalents to HTML, the markup language used in most pages on the regular World Wide Web. Successfully used and widespread in Europe, WAP is being increasingly adopted globally.

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