A driver is software that allows your computer to communicate with hardware or devices. Without drivers, the hardware you connect to your computer — for example, a video card or a webcam — will not work properly.
In most cases, drivers come with Windows or can be found by going to Windows Update in Control Panel and checking for updates. If Windows doesn't have the driver you need, you can find it on the disc that came with the hardware or device you want to use, or on the manufacturer's website.
In computing, a device driver is a computer program that operates or controls a particular type of device that is attached to a computer. A driver typically communicates with the device through the computer bus or communications subsystem to which the hardware connects. When a calling program invokes a routine in the driver, the driver issues commands to the device. Once the device sends data back to the driver, the driver may invoke routines in the original calling program. Drivers are hardware-dependent and operating-system-specific. They usually provide the interrupt handling required for any necessary asynchronous time-dependent hardware interface.
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