Other benefits of the Rar file format include redundancy, which can enable damaged archives to be repaired, and support for international character sets, allowing files with non-English filenames to be stored. "Rar" is a development of the Zip compression method invented by a Russian programmer Eugene Roshal (hence the name, Roshal Archive.) The Rar format uses advanced compression algorithms that can create some of the smallest archives - typically 8 to 30 per cent smaller than Zip archives - but the penalty is that compression may take a long time. There are many different compression techniques in use today.
In short, Rar files are a space-saving way of storing single files or groups of related files. "Compressed" means that mathematical techniques have been used to reduce the space needed to store the files, so that the size of the archive may be much smaller than the total size of the files it contains. It may even contain folders full of files, much like folders on your hard disk. The term "Archive" means that the file may contain not just one, but several files.
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