SSH, which is an abbreviation for Secure Shell, is a network protocol that's used to transfer protected data between a client and a web server, which makes it impossible for unauthorized parties to intercept any data. Many tech-savvy customers favor SSH mainly because of the enhanced security level. The connection is created and the commands are sent through a command line. The available options depend on the type of Internet hosting service - on a shared server, for instance, files could be moved or deleted, databases may be imported and exported, and archives could be created or unpacked. On a virtual or a dedicated server, your choices are much more - the web server and the database server could be started/stopped/rebooted, server-side software may be set up and a lot more. These things are not possible on a shared server, because full root access is required and all the other clients on that server would be affected. Even though SSH is employed largely with UNIX-like OSs, there are SSH clients for other OSs as well - Windows, Mac OS, and so forth.