This Web Service tutorial covers various given concepts :

install postman,install postman for chrome,how to install postman,What is a Web Service,Web Services Beginner Tutorial,how web services work,basics of web services,introduction to web services ,web service examples.

For postman download and installation refer the link :
https://www.getpostman.com/

Example of API of Student Application
To download student application refer the link below :
https://drive.google.com/file/d/1o7P2...

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