Convert tar.7z to arj

What is the difference between .tar.7z and .arj?

Description: This format works based on the LZMA principle compression algorithm. It was originally used in 7-Zip archives. tar.7z archives were created for storing info about file owners and for ease of use in Unix systems, based on a TAR archiving tool.; The ARJ Compressed File Archive (.arj) is a file format used for data compression and archiving. Developed in the early 1990s by Robert Jung, ARJ stands for "Archived by Robert Jung". The format allows for efficient compression of files, supporting multi-volume archives, which means a large archive can be split into several smaller files for easier management and distribution. It also supports a high level of encryption for secure data storage.