Today is Debian‘s 20 anniversary. Debian is a free operating system (OS) for your computer. Debian started as Linux distribution, but Debian systems currently use the Linux kernel or the FreeBSD kernel (work is in progress to provide Debian for other kernels).
Debian was begun in August 1993 by Ian Murdock, as a new distribution which would be made openly, in the spirit of Linux and GNU. It started as a small, tightly-knit group of Free Software hackers, and gradually grew to become a large, well-organized community of developers and users. Debian is pronounced /ˈde.bi.ən/ and the name comes from the names of the creator of Debian, Ian Murdock, and his wife, Debra.
Nowadays Debian is widely used as itself and as basis for many other Linux distributions. For example Ubuntu and Debian are distinct but parallel and closely linked systems. There are many other distributions that also share the same basic infrastructure (package and archive format).