Device is an English word meaning equipment, equipment, tool. In the IT field, it is often used in the sense that it means relatively simple electronic parts / devices with specific functions / applications, and devices and peripherals inside the computer. In the latter sense, devices such as a CPU, a memory, a hard disk, and a video card constituting a computer, and peripheral devices such as a keyboard, a mouse, a printer, and a display are referred to as devices. In order to operate the device, software to be controlled is necessary, which is referred to as a device driver. Since most of the device drivers of major products are often bundled with the OS, they are not usually conscious of it, but when connecting newly purchased devices, the user is required to install a device driver Often it is.