A RAR file is a compressed file (similar to a zip file) that uses the file name extension .rar. A RAR file can be transferred to other computers more quickly than uncompressed files.
Windows does not natively support RAR files, but there are third-party programs that do. To extract files from a compressed RAR file, you need to use a program that is designed to work with RAR files.
An alternative to using RAR files is to use zip files, which can be compressed and uncompressed in Windows without installing any program. To learn more about zip files, see Compress and uncompress files (zip files).