Debian is one of the oldest and most influential GNU/Linux distributions, distinctive both for being run by volunteers rather than a company and for the strictness of its commitment to free software. Its own about page describes Debian as “an association of individuals who have made common cause to create a free operating system,” built around a kernel (most commonly Linux) and the GNU tools, and bundling many tens of thousands of packaged software programs.
The project was begun in August 1993 by Ian Murdock, who, in the words of the about page, set out to create “a new distribution which would be made openly, in the spirit of Linux and GNU.” The name itself is a small piece of history: it combines Ian Murdock’s first name with that of his then-girlfriend and later wife, Debra, giving “Debian.”
What set Debian apart was its insistence on transparent, collaborative development and on clear rules about what could be included. The distribution is assembled and maintained by a large, geographically dispersed body of volunteer developers operating under a written constitution and elected leadership, rather than by employees of a single firm. This governance model let Debian outlast many commercially backed distributions.
A defining technical contribution is Debian’s package management. The .deb package format, the low-level dpkg tool, and the higher-level Advanced Package Tool (apt) together made it possible to install, upgrade, and remove software while automatically resolving dependencies across the thousands of packages in the archive. This system became one of the two great families of Linux package management and is reused, largely unchanged, by the distributions built on top of Debian.
Debian also pinned down, in formal documents, what “free” was supposed to mean. Its Social Contract and the Debian Free Software Guidelines spell out the criteria a license must meet for software to enter the main archive, and commit the project to remaining “100% free.” Those guidelines went on to become the direct basis of the Open Source Definition.
Perhaps Debian’s largest practical legacy is downstream. Ubuntu, the distribution that did the most to bring Linux to ordinary desktop users, was built directly on Debian, inheriting its packages and its apt tooling. Through Ubuntu and many other derivatives, Debian’s engineering and its principles reached far beyond its own user base.