Compression means the reduction of file size up to 90%. We can compress the files if there is a need of sending some files via e-mail or add password protection to our files. There are several algorithms we can use for compression. According to the algorithm used, the program adds an appropriate file extension. The most used are .zip ; .rar. The best known programs for compression are WinRar, 7-Zip, WinZip.
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