A driver is a piece of software that converts commands such as 'print' into instructions that the particular piece of hardware (printer) can understand.
The operating system is usually pre-loaded with drivers for all of the hardware it needs to control.
However, as time goes by, new hardware is developed and the operating system won't have the correct driver. So, the manufacturer of the hardware will provide the correct 'driver' on a CD-ROM or from their website so that you can install it.
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Click on this link: Driver