An abreviation for REpresentational State Transfer. A design pattern for stateless client-server systems. Popular in the implementation of web services.
ReST (Representational State Transfer) is a stateless client-server architecture commonly used on the web.
Use this tag if on questions that are specifically about the REST aspects of a protocol, such as how to authenticate requests. If a question is about a web application but not about its RESTful aspects, just use web-service or web-application.