1. The document describes the main components of a computer system including the system unit, mouse, keyboard, monitor, printer, speakers, web cam, and scanner. 2. The system unit contains the central processing unit and other electronic components that process information. 3. The mouse is used to select items on the screen and is connected to the system unit by a wire. The keyboard is used for typing and has keys for letters, numbers, and special functions. The monitor displays information visually using text and graphics.