The document provides descriptions of common computer components including the keyboard, mouse, hard drive, monitor, and system unit. The keyboard allows users to enter text and symbols into a computer. The mouse controls the cursor and allows selection of items on screen. The hard drive is a non-volatile storage device typically installed inside the computer case. The monitor displays visual information like text and graphics. The system unit, or computer case, houses the main internal components like the motherboard, CPU, and RAM.