SSH, which is an abbreviation for Secure Shell, is a network protocol employed to exchange encrypted info between a client and a web server, which makes it impossible for unauthorized parties to intercept any information. Many tech-savvy clients prefer SSH mainly because of the enhanced security level. The connection is established and the commands are delivered using a command line. The accessible options depend on the type of web hosting service - on a shared server, in particular, files could be moved or deleted, databases may be imported and exported, and archives may be created or unpacked. On a virtual or a dedicated server, the choices are a lot more - the web server and the database server could be started/stopped/rebooted, server-side software may be set up and more. These things are not possible on a shared server, since full root access is required and all the other customers on that server shall be affected. Though SSH is employed mainly with UNIX-like OSs, there are SSH clients for other OSs too - Windows, Mac OS, and so on.