what is port 22 used for

Port 22 is the default port for the Secure Shell (SSH) protocol, which is widely used for secure remote administration and secure file transfer. SSH is a network protocol that allows secure communication between two computers, and it is used to create secure tunnels for other application protocols. An SSH server, by default, listens on the standard Transmission Control Protocol (TCP) port 22. Port 22 is used for secure logins, file transfers (scp, sftp), and port forwarding. It is part of the TCP/IP protocol suite, which is the foundation of the modern internet.