URI stands for Uniform Resource Identifier. Each resource in REST architecture is identified by its URI.
Operations on the base URI affect the set of resources as a whole
1. GET lists them
2. POST adds a new resource to the set
3. DELETE deletes the whole set
4. PUT replaces the set with a new set
Operations on an ID-qualified URI affect an individual resource
1. GET retrieves it
2. DELETE destroys it
3. PUT replaces it or create if doesnot exists