The document describes several common computer parts: The monitor displays images generated by the computer without saving them. It contains a display screen, circuitry, and enclosure. Modern monitors use LCD while older used CRT. The mouse is a pointing device that detects motion on a surface to move a cursor on the screen. It has a physical object held in the hand connected to one or more buttons. The CPU, or central processing unit, executes computer programs and has changed dramatically in design over time but maintains the same basic functions. Speakers connect via audio jack or USB to output sound from the computer and come in internal or external varieties with different power sources. The keyboard uses an arrangement of buttons to input letters,