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Quick Answer. Defrag is a shortened form of the word defragment, a process of sequencing fragmented data on a hard drive or storage device. Defragmentation allows computers and other electronic storage devices to work more efficiently in general performance, as well as in the retrieving of requested files and sites.
Defragmenting takes the files and makes them contiguous, reducing the amount of time the hard drive has to work. This can really speed things up. Defragmenting is one of the more important ways to keep your system running smoothly.