7zip is an open-source archive program originally developed for Windows, which can pack or unpack a variety of archive formats including its native format 7z as well as XZ, GZIP, TAR, ZIP and BZIP2. 7zip is also popularly used to extract RAR, DEB, RPM and ISO files
Besides simple archiving, 7zip can support AES-256 encryption as well as self-extracting and multi-volume archiving. For POSIX systems (Linux, Unix, BSD), the original 7zip program has been ported as p7zip (short for "POSIX 7zip").
It is recommended to install p7zip-full package (not p7zip) since this is the most complete 7zip package which supports many archive formats. In addition, if you want to extract RAR files, you also need to install p7zip-rarpackage as well. The reason for having a separate plugin package is because RAR is a proprietary format
To install 7zip just run the following command via your systems terminal.
sudo apt-get install p7zip-full p7zip-rar