An input/output (I/O) module is a device used to connect a computer to other devices, such as a printer, scanner, or external storage device. It acts as a bridge between the computer and the other device, allowing the computer to send and receive data. I/O modules can be used to connect a variety of devices, such as keyboards, mice, monitors, and external storage drives. They are also used to connect a computer to a network, allowing it to communicate with other computers on the network. I/O modules are an essential part of any computer system, as they enable the computer to interact with other devices and networks.