7-Zip is a free and open-source file archiver that allows users to compress and decompress files efficiently. It supports various archive formats, including its own 7z format, which offers high compression ratios. The software is available for multiple operating systems, including Windows, Linux, and macOS. One of the key features of 7-Zip is its strong encryption capabilities, which help protect sensitive data. Additionally, it provides a simple user interface, making it accessible for both beginners and advanced users. Overall, 7-Zip is a versatile tool for managing files and saving storage space.