external device
Peripheral devices (Peripherals or English: Peripheral Devices), also known as peripheral equipment, external equipment (referred to as peripherals), is able to power and normal operation of the computer's non-essential hardware equipment. They can work independently or semi-independently and do not rely on a computer, and can often extend or enhance the functionality or performance of the accessed computer. Including input and output devices and some storage devices. USB devices or portable devices such as keyboards, mice, scanners, cameras, monitors, printers, optical drives, UPS uninterruptible power supplies and other flash drives, memory card readers, digital photo frames, MP3 / MP4 players, mobile hard drives. A normal computer can boot into the ready state of preparation even if it is removed (although it may be difficult or impossible for a user to operate such a computer). ...