What are REST guidelines? What is the difference between Rest and Restful?

Separation of Client and Server - The implementation of the client and the server must be done independently.

Stateless -  The server will not store anything about the latest HTTP request the client made. It will treat every request as new request.

Uniform interface – Identify the resources by URL www.abc.com/api/questions

Cacheable – The API response should be cacheable to improve the performance.

Layered system - The system should follow layered pattern. For example, MVC is a layered system.

 
RESTFUL Service: If a system written by applying REST guidelines, then it is also called REST service or RESTful services.

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