SSH, which is an abbreviation for Secure Shell, is a network protocol that is used to transfer encoded data between a client and a website hosting server, which makes it impossible for unauthorized parties to intercept any data. Many tech-savvy customers choose SSH due to the better level of security. The connection is made and the commands are sent via a command line. The available options depend on the type of hosting service - on a shared server, in particular, files can be transferred or deleted, databases could be imported and exported, and archives may be set up or unpacked. On a virtual or a dedicated server, the choices are a lot more - the web server and the database server may be started/stopped/rebooted, server-side software could be installed and a lot more. These things are not possible on a shared server, since full root access is required and all the other clients on that server would be affected. Though SSH is employed mainly with UNIX-like OSs, there are SSH clients for other OSs too - Windows, Mac OS, etc.