What is REST?

Answer:

REST (REpresentational State Transfer) is a simple stateless architecture that generally runs over HTTP.
REST, which retrieves content from a Web site by reading a designated Web page that contains an XML file, is often used in mobile applications, social networking Web sites, mashup tools and automated business processes.
The REST style emphasizes that interactions between clients and services is enhanced by having a limited number of operations (verbs). Flexibility is provided by assigning resources (nouns) their own unique universal resource indicators (URIs). Because each verb has a specific meaning (GET, POST, PUT and DELETE), REST avoids ambiguity