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7-Zip is a free and open-source file archiver software that is used to compress and decompress files. It was developed by Igor Pavlov and was first released in 1999. The software supports a wide range of file formats including 7z, ZIP, RAR, TAR, GZIP, BZIP2, and more.

7-Zip uses a high compression ratio algorithm called LZMA (Lempel-Ziv-Markov chain algorithm) to achieve smaller file sizes while maintaining the original file quality. It can also create self-extracting archives which can be useful for sending files to others who may not have an archiving tool.

In addition to compression and decompression, 7-Zip also supports file encryption and has a powerful file manager that allows users to browse and manage files within archives. The software is available for Windows, Linux, and macOS operating systems.

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