The term 'User Interface' can be summarized as a system of graphical elements that allow a user to interact with a computer. The acronym MS-DOS stands for Microsoft Disk Operating System and is an operating system developed by Microsoft for use on personal computers. It was the most commonly used member of the DOS family of operating systems and was the main operating system for IBM PC compatible personal computers during the 1980s and 1990s. MS-DOS was the first operating system to use a graphical user interface, allowing users to interact with the computer using a mouse and keyboard.