: It stands for Roshal Archive , a proprietary format developed by Eugene Roshal.
Where did you find this file, or what were you hoping it contained? RAR - Apps on Google Play
: Unlike basic ZIP files, RARs support high-level data compression, error correction (to repair damaged archives), and "file spanning" (splitting a huge file into smaller parts). How to Open It
: It bundles multiple files into one smaller container to save space and speed up transfers.