URI = Uniform Resource Identifier.

It has 2 types. 

  (i). URN, (ii). URL

  Urn = Uniform Resource Name, Url = Uniform Resource Locator.

URI stands for Uniform Resource Identifier

The purpose of URI is to locate

a resource on the server 

hosting the web service.

A URI format is:

<protocol>://<servicename>/<ResourceType>/<ResourceID>