Final answer:
A 'device driver' is the program that allows communication between a computer's device and its operating system. This software is essential for the device's functionality within the system.
Step-by-step explanation:
The special program that enables a device and the operating system of a computer to communicate with each other is known as a device driver. This software acts as an intermediary, translating the operating system's instructions into commands that the device can understand, and vice versa. Without the correct device driver, the hardware device may not function properly or might not be recognized by the system at all.
When you install a new device, the appropriate driver must typically be installed as well. In some cases, the operating system may have a pre-installed driver that works with the device, or it might download and install it automatically via the internet. Having the correct driver is crucial for the smooth operation of the computer and all its peripherals.