The Hypertext Transfer Protocol (HTTP) is 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.

Example: When loading a website from your browser a GET request is executed. Then the server returns a response to the client. The response contains status information about the request and may also contain the requested content.

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