You have to download and install a third-party software to open and extract RAR files on Mac Monterey. How to open and extract RAR files on a Mac
In this way, you only have to download one file (or can upload a file to an email), and the receiver will only have to download one file instead of several separate files. Both are dedicated zip file formats for compressing various files into one file. A RAR file is actually very similar to a ZIP file.