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 customers choose SSH mainly because of the enhanced level of security. The connection is created and the commands are delivered using a command line. The accessible options depend on the type of Internet hosting service - on a shared server, in particular, files may be transferred or deleted, databases can be imported and exported, and archives could be set up or unpacked. On a virtual or a dedicated server, your choices are much more - the web server and the database server may be started/stopped/rebooted, server-side software can be installed and a lot more. These things are not possible on a shared server, due to the fact that full root access is required and all the other customers on that server would be affected. Though SSH is employed mainly with UNIX-like OSs, there are SSH clients for other OSs as well - Windows, Mac OS, etc.