REST API to read, update, create, and delete records in ServiceNow

REST-Representational State Transfer, is a simple stateless architectural style of world wide web (www) that leads to high performance and more maintainable architecture because of its coordianted sets of constraints to the design of components in a distributed hypermedia system . When a web service uses this architecture it is called as REST api.  A simple video Guide of using REST api to read,update,create and delete (CRUD) operation with JSON data in ServiceNow.