The driver is to add a small piece of code in the operating system, which contains information about the hardware device, communicate this information to the computer hardware.
Drivers are hardware vendors to write the operating system configuration files, no driver, computer hardware will not work.
Drivers because of different operating systems and different hardware vendors to ensure compatibility and enhanced hardware features escalating drive.
It is part of the hardware drivers, who do not belong to you originally installed a computer's hardware, the system will require the installation of drivers, connect the new hardware and computer system.
Driver plays the role of communication, will tell the computer system hardware functions, and will also be communicated to the instruction set of hardware to make him work.