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REST's protocol is HTTP. REST isn't an API, but you can create RESTful API's.

Yawn.

Edit: The first three sentences on the Wikipedia article are all you need to know. http://en.wikipedia.org/wiki/Representational_state_transfer

REST's protocol is not HTTP. Quoting the very page you linked:

> REST was initially described in the context of HTTP, but it is not limited to that protocol.