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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.
Some defragmentation programs can also optimize the hard disk, which places similar files in similar locations. For example, program files are stored in one area, system files in another, and documents in another area of the disk. It is a good idea to defragment you hard drive about once a month during typical use.