It supports data compression, error recovery, and file spanning (splitting large archives into smaller parts).

Be cautious when opening .rar files from unknown sources, as they can sometimes contain harmful files, just like any other file format, say Avast. To help you further, could you tell me:

RAR stands for "Roshal Archive," a proprietary file format developed by Eugene Roshal.

(like WinRAR or 7-Zip) installed already?