A RAR file is an archive that contains one or more files compressed with RAR compression. It uses a higher compression ratio than typical ZIP compression and incorporates a proprietary compression algorithm that is now used by other compressors, including 7-Zip for its .7Z files. RAR files may be extracted using a variety of programs.
The RAR compressor can also create spanned, or multi-volume, archives, which are split across several compressed files. These files typically have file extensions from ".R00" to ".R99," or they may all have the standard ".RAR" extension.
NOTE: The name "RAR" stands for "Roshal ARchive," which was named after Eugene Roshal, the RAR compression algorithm developer.