From https://en.wikipedia.org/wiki/Representational_state_transfer: Representational state transfer (REST) is a software architectural style that describes a uniform interface between physically separate components, often across the Internet in a Client-Server architecture.(...) REST has been employed throughout the software industry and is widely accepted as a set of guidelines for creating stateless, reliable web APIs. A web API that obeys the REST constraints is informally described as RESTful.
General desciption of RESTFUL:
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