What is Device driver?

What is Device driver?
A device driver is a code that performs device control operations specific to the device being addressed.It is software layer that lies between applications and the actual device.
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A more formal definition would be Device drivers are distinct black boxes that make a particular piece of hardware respond to a well defined internal programming interface.
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Device Driver lies between the Hardware & operating system.Through this layer only all the request/response between the OS & H/w are happening.  

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