What is SSH? How it works?

What is SSH?
>>> SSH stands for Secure Shell. It is a cryptographic network protocol for operating network services securely over an unsecured network. Typical application include remote command-line log in and remote command execution, but any network sevice can be secured by SSH.

Working:-
>>> SSH works by making use of the client server model to allow for authentication of two remote systems and encryption of the data that passes between them. The host listens on port 22 for any incoming connections.

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