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Version control (also known as revision control, source control, and source code management) is the software engineering practice of controlling, organizing, and tracking different versions in history of computer files; primarily source code text files, but generally any type of file.
When a file is "deleted" using a FAT file system, the directory entry remains almost unchanged except for the first character of the file name, preserving most of the "deleted" file's name, along with its time stamp, file length and — most importantly — its physical location on the disk.