Peripherals allow a computer to perform additional services, usually those related to input/output functions. Although they can be externally or internally connected, peripheral are mainly external devices. There are three different types:

• Input Peripherals: This includes the computer mouse and keyboard as well as scanners and Web cameras.
• Output Peripherals: Output devices such as printers, plotters and monitors.
• Storage Peripherals: External hard drives, flash drives and media cards. These peripherals usually provide both input and output functions.