SHELL

secure shell (ssh)

SSH or Secure Shell is a network communication protocol that enables two computers to communicate and share data

ssh secure shell client

SSH client
The SSH Secure Shell for Workstations Windows client (ssh2 client) is a program that allows secure network services over an insecure network. SSH Secure Shell for Workstations Windows Client replaces other, insecure terminal applications, such as Telnet and FTP.

https://www.es.ele.tue.nl/mininoc/doc/ssh.htm#:~:text=The%20SSH%20Secure%20Shell%20for,such%20as%20Telnet%20and%20FTP.