RAR format is derived from the phrase Roshal Archive that are related to the company name, the manufacturer of this software.

this format, one of the other most well-known formats for compression. That it in DOS, was that after a while in other operating systems also came into existence. This extension is open source. But other software to open this extension plugin is necessary have.

compression RAR usually does more formats, like ZIP and gzip, but with yields much higher.

the format in terms of power, high compression rates consume time to compress and open files a lot of resemblance to 7z.