A Peripheral can be an input or output device.
For Example;
peripheral devices
Input, output and storage.
Mouse: Input Keyboard: Input Diskdrive: Storage
A computer case by itself is not a peripheral as such, nor is it an input or output device. It is just the cabinet that contains the computer system. That said, the components inside fill all of those roles. The case contains the motherboard which is about output, input, and processing.
A copier is neither an input device nor an output device because it need not be connected to a computer and usually is not. A Printer, which may also be used as a copier, is an output peripheral device. A Scanner, which feeds data to a computer, is an input peripheral device. Modern digital copiers use scanners as their "front ends". The scanner is then an input device to a copier.
A scanner serves as an input device only.
peripheral devices
peripheral
The main function of peripheral devices is to add extra functionalities to your computer. It can be input features (scanning, receiving faxes, voice recording, etc.) or output features (printing, sending faxes, making sounds, etc.).
Hardware devices. Input & output devices.
A computer peripheral, or peripheral device, is an external object that provides input and output for the computer. Some common input devices include: * joystick * pen tablet * MIDI keyboard * digital camera * video camera
subroutine