OS intermediary connection between users with the hardware by the user doesn't have to understand in the work of hardware, so OS must do not control the functions of the various hardware. They represent a user by a component as a routine. The control device of each species.
GUI is a user interface using symbols. Is a design parts of computer programs to interact with the user by using Icon, images และสัญลักษณ์ other to replace the 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.