Peripheral devise are the computer devices that are connected to the computer externally such as printer, scanner, keyboard, mouse, tape device, microphone and external modem.
Peripheral devices can be classified according to their functions;
Input devices are the type of the computer devices that are used to provide the control signals to the computer. Keyboard and the Mouse are the examples of the input devices.
Output devices are the devices that are used to display the results. Printer, scanner, speaker and the monitor are the examples of the output devices.
A storage device is a device that is used to store information such as an external hard drive which connects to USB 2.0 or E-Sata and its outside of the computer system.