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Archiving utilities allow an individual to compress/decompress files, making them smaller for uploading, downloading, putting on disk, etc. To decompress the file, you usually need a decompression program of the same format, to expand the files and make them usable again. There are many different formats of compression which vary in popularity. Currently ZIP is the most popular, but other formats such as ARJ, RAR, and even LHA and ARC have their adherents.
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