Winrar for PC, as you may already know, is the most popular tool for compressing and extracting files, serving over 500 million users around the world and has been in the market since 1995.
Although MS Windows comes with a default tool for archiving and extracting files, it may not always be sufficient for your needs. Winrar for PC has a user-friendly interface and supports a variety of compression formats including ARJ, BZIP2, CAB, GZip, ISO, LZH, RAR, TAR, UUE, Z, 7-Zip, and ZIP. Maybe every archiving software can extract RAR formats but only a few of them can compress your files into the popular RAR format.
Using Winrar you can: set authentication for accessing archived files, make self-extracting archives, use drag & drop facility to add your files into the existing archive or extract them from it, check your archives against viruses, create a multi-volume archive, and repair damaged archives.