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According to Wikipedia:

1. Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution.

Examples of services that can use SSH are Git, rsync and X11 forwarding. Services that always use SSH are SCP and SFTP.

An SSH server, by default, listens on the standard TCP port 22. An SSH client program is typically used for establishing connections to an sshd daemon accepting remote connections. Both are commonly present on most modern operating systems, including macOS, GNU/Linux, Solaris and OpenVMS. Proprietary, freeware and open source versions of various levels of complexity and completeness exist.

Software

Server only

Client only

Securing

See Security#SSH.

See also

• Terminal multiplexers (often used over SSH)

• Wikipedia:Comparison of SSH clients

• Wikipedia:Comparison of SSH servers

• SSH Key Fingerprint formats