They often achieve smaller file sizes than ZIP files.
If you don't want to install software, you can use a web-based service like CloudConvert : lathin.rar
Right-click the selected files and choose "Add to archive..." . Configure: In the window that appears: Change the "Archive name" to lathin.rar . Ensure "RAR" is selected as the archive format. They often achieve smaller file sizes than ZIP files
RAR files are preferred over standard ZIP files in several scenarios: part2) for easier emailing or storage.
Large files can be split into smaller "volumes" (e.g., part1, part2) for easier emailing or storage.