It primarily uses the LZMA (Lempel-Ziv-Markov chain algorithm) and LZMA2 methods for compression.
The 7z format is a container for compressed data that uses various algorithms to significantly reduce file sizes. Key features include: you need specialized software
To view the "informative text" inside such a file, you need specialized software, as most operating systems do not open .7z files natively. 7-Zip - VA.gov you need specialized software