This document provides an overview of computer system hardware by summarizing different types of input and output devices. It describes common input devices like keyboards, mice, scanners, and webcams that allow users to provide data to computers. It also outlines various storage options for computers including hard drives, CDs, DVDs, USB flash drives, and floppy disks. Finally, it lists output devices such as monitors, printers, projectors, sound cards, speakers, and video cards that enable computers to display or playback information for users.