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. Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux. Debian systems currently use the Linux kernel. Linux is a pieceof software started by Linus Torvalds and supported by thousands of programmers worldwide.