It often squeezes files much smaller than a standard ZIP can.
It can split a massive 10GB file into ten smaller 1GB "parts" (like .part1.rar , .part2.rar ), making it easier to upload and download on slower connections.
The Mystery of the Archive: What You Need to Know Before You Click "Download"
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Always run the file through a reputable antivirus program or a site like VirusTotal.