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What are commands?
Commands used to be the way that all computers were operated. Since the beginning of keyboards and monitors, Computers required users to provide text based instructions to do things like work on files or use applications. A command interface is now often referred to as a CLI (Command Line Interface).

>> More information on the CLI

Today of course, most computers are synonymous with the use of a Graphical User Interface or GUI, which uses Windows, Icons, Menus and Mouse pointers (WIMP) to operate the computer.

>> Definition of a GUI and comparing a GUI to a CLI