If you did not expect to receive this file or do not know the sender, . RAR files can be used to hide malicious scripts or executable malware. Always scan the archive with antivirus software before extracting the contents.
Where did you find this file, or what were you hoping it contained? RAR - Apps on Google Play
: WinRAR is the official tool, but 7-Zip and RAR Opener are popular free alternatives.
: It bundles multiple files into one smaller container to save space and speed up transfers.
Since "RAR" is a compressed file format, here is what you should know about handling it: What is a RAR file?