SSH
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ssh is short for Secure SHell, a protocol for remote login, itself used by the scp (Secure CoPy) command, which is used by some IndieWeb community members to update their personal sites.
SSH allows a user to log from their local computer into a remote computer anywhere on the internet. It is a more secure replacement for telnet.
On Windows, Linux or Mac, the ssh client is usually pre-installed. Most people are using OpenSSH from the OpenBSD folks. GNU has its own experimental version, known as GNU lsh but it is not widely used. There are various third-party applications that support SSH on Windows.
SSH servers can accept passwords, or SSH Key Pairs for authentication.
Typical SSH interactions require verifying a key signature upon first remote login to a particular machine and then trusting that for future remote logins to that machine, a technique known as TOFU for Trust On First Use.
Mosh
Mosh is a replacement for interactive SSH. It handles the inherent latency of poor Wi-Fi, cellular, and long-distance connections better than SSH.
See Also
For more about SSH, SCP, TOFU and mosh see: