The Hypertext Transfer Protocol (HTTP) is designed to enable communications between clients and servers. HTTP works as a request-response protocol between a client and server. A web browser may be the client, and an application on a computer that hosts a web site may be the server.
There are two main types of web request:
GET request:GET carries request parameter appended in URL string.
POST request:POST carries request parameter in message body which makes it more secure way of transferring data from client to server in http protocol.
For more information on web request click on the link (https://www.w3schools.com/tags/ref_httpmethods.asp).