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A microsecond is a unit of time equal to one millionth of a second. It is also equal to one 1000th of a millisecond, or 1000 nanoseconds.
Many of these units of very fine time measurement are used in high-tech laboratories where scientists measure data transfer unaffected by many of the usual limitations.
The microsecond is part of a string of time measurements that extends into extremely short periods of time. For instance, a picosecond is a 1000th of a nanosecond, and a femtosecond is a 1000th of a picosecond.
All of these very minute time period references apply to information technology in different ways. Scientists and technology professionals are always looking at how to use more precise time measurements in evaluating technologies.