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This page describes what "Debian GNU/Linux" is, not just Debian.
What is Debian GNU/Linux ?
Debian is a free operating system 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 many of the basic tools are made by the GNU project, so it is sometimes called GNU/Linux. You can read more (on the website).
Related Pages:
DebianReleases - the different releases (vesions) of Debian
Debian GNU/Hurd (not officially part of Debian): Debian with a Hurd kernel
Debian GNU/kFreeBSD (no longer part of Debian: was part of DebianSqueeze): Debian with a FreeBSD kernel.
Debian_GNU for information about Debian with other kernels