What are methods in rest in Salesforce?

Hello,

These are the classes containing methods and properties you can use with Apex REST.

Class                Description
1.RestContext Class  Contains the RestRequest and RestResponse objects.
2.request  Represents an object used to pass data from an HTTP request to an Apex RESTful Web service method.
3.response  Represents an object used to pass data from an Apex RESTful Web service method to an HTTP response.