A buffer is a storage region in the physical memory to hold data temporarily while it is being shifted from one place to another for example while retrieving data from an input device or writing into an output device like printer. It is needed primarily to compensate the difference in operating speeds of the two devices working in conjunction, such that the rate at which data is received is unequal to the rate at which data is processed. Most buffers are implemented in software which use RAM for temporary storage.
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