The Debian GNU/Linux distribution differs from others in several ways. Firstly, Debian is a non-commercial organisation of volunteers, that does not sell anything. The second and most appealing difference is the peer review and continuous pressure among the members to provide a high quality of packages. The Debian society has a constitution, elects its leader, and transparently describes policies for the creation of packages utilising specific technologies.
With these principles, Debian achieved the largest collection of ready-to-install Free Software on the Internet.