OS was built with the main purpose is to facilitate the work to the user by the user doesn't have to
know the function of the hardware. It can work easily. Therefore, it must have a contact with the
user. In a simple manner to use.
GUI is a user interface using symbols. Is a design parts of computer programs to interact with the
user by using Icon, images and other symbols to represent various style of the program, instead of
the user to type commands in the work. The user can work easily and quickly. Don't have to
remember the order.