Unlike WinRAR, which famously "asks" for a license forever, 7-Zip is completely free for personal and commercial use under the GNU LGPL license.
Most users search for "skachat besplatno" (download for free) to avoid the "nagware" found in paid alternatives. 7-Zip takes this a step further:
It introduced the 7z format , which often compresses files 30–70% better than the standard ZIP format.
It can unpack almost anything, from standard ZIPs and RARs to more "exotic" formats like ISO, TAR, and MSI. The Secret Power: LZMA