Deb is the binary package format used by Debian, Ubuntu, Linux Mint, … Use this tag for questions about building or inspecting deb packages.
The deb file format is the format of packages that can be installed on Debian debian and derivatives such as Ubuntu ubuntu, Linux Mint linux-mint, etc.
Use this tag for questions about the deb format itself, about tools to manipulate deb packages, and about making deb packages. For questions about the tools to install these packages, use dpkg or apt as appropriate.