This is the file extension for a Roshal Archive —a compressed file format similar to a ZIP file but often with better compression and the ability to be split into multiple parts. Why are they packaged as RAR files?
If you have downloaded a file named something like E,H.rar , you cannot open it like a regular folder. You need an "extractor" to unpack the contents.
Instead of downloading 200 individual images, you download one single .rar file that keeps everything in the correct order.
RAR files use advanced algorithms to shrink large collections of images (like a 200-page manga) into a much smaller download.
RAR files can include "recovery records," which help fix the file if a tiny piece of data gets corrupted during the download. How to Use These Files
