7-Zip is a file archive utility that can compress and uncompress a variety of archive formats including: ZIP, CAB, RAR, ARJ, GZIP, BZIP2, Z, TAR, CPIO, RPM and DEB. Its own file compression format 7z, can compress files 30-70% better than ZIP files.
Other useful features of 7zip:
- Integrates with Windows Explorer - right-clicking on files and folders in Windows Explorer will show various actions that can be done by 7-Zip.
- Command line version included - useful for batch files to automate backup chores.
- Ability to create self-extracting EXE files from 7z files.