1. The document discusses various input and output devices for computers. Common input devices include keyboards, mice, touch screens, joysticks, and scanners. 2. Keyboards allow text input and use a QWERTY layout. Mice are used to select menus and interact with programs. Touch screens can be optical or electrical. 3. Common output devices are monitors and printers. Monitors can be CRT, flat panel, monochrome, grayscale or color. Printers include dot matrix, inkjet, and laser printers.