What is SSH (Secure Shell)?

SSH (Secure Shell) is an encrypted network protocol designed for secure data communication. With SSH, secure communication between two systems connected to a network is established through an encrypted channel. One of the two systems acts as the client, and the other as the server. OpenSSH, which facilitates the use of SSH, usually comes pre-installed with Unix systems. If OpenSSH is not installed, it can be downloaded and set up from a secure source, which Unix considers as a reference.

Port 22 needs to be open to connect Unix to the network using SSH. It is possible to connect to Unix using SSH on Windows. For this, it is necessary to download, install, and use external applications that enable the use of OpenSSH for Windows systems (e.g., PuTTY).