REST is an abbreviation of Representational state transfer — a style of software architecture designed for distributed systems, typically for the World Wide Web. Kentico has a built-in REST service, which can be used to read, create, update and delete virtually any object or page within the system. These operations are performed by requesting specific URLs. The Kentico REST service is RESTful, which means that it supports both directions of data transfer (from and into the system).
Kentico also provides the Grid for REST service web part (for Portal Engine sites), which can be used to display data obtained from the REST service in a simple grid. You can find an example of this web part on the /Examples/API/REST-service page on the sample Corporate Site.