Use a computer from elsewhere
A developer can open a terminal on their laptop and connect to a server with SSH. Commands they type then run on the server. SSH encrypts the connection and checks access with a password or key.
Teams also use SSH to transfer files or access an online Git repository. SSH keys come in pairs: a public part you can share and a private part you must protect.
Keep access limited
An SSH connection may let someone change a server directly. Teams grant access only when needed, review it when responsibilities change, and record important actions.