SSH (Secure Shell) is a protocol for creating a secure connection between two computers. The secure SSH connection provides authentication and encryption. It was designed as a replacement for the legacy `telnet` application. The computer being connected by SSH must be run as ssh daemon, or a server process. It is a protocol which allows you to login remotely to your servers.

Private keys may be used to automate the login process. Using public key authentication is also another way of authentication. SSH is a very secure program like login, commands, text and everything else is encrypted when using SSH.