Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run.
Latest version of Debian is 8, code named jessie.
The Debian Project was first announced in 1993 by Ian Murdock, and the first stable release was made in 1996.
Many popular Linux distributions like Ubuntu, Linux Mint, etc.. are based on debian.
Debian Sources List Generator