Debian is an OS (operating system) that is composed of the free software mostly carrying the GNU. Debian is developed by an internet collaboration of volunteers named The Debian Project.
Debian systems can use Linux kernel (known as the Debian GNU/Linux distribution), the FreeBSD kernel (known as the Debian GNU/kFreeBSD distribution).
Debian GNU/Linux is one of the most popular Linux distributions for the Internet servers and personal usage. Debian has been forked many times, but is not affiliated with its derivatives.
The Debian project plays important role in the free software creation and distribution.
Debian Linux is created on base of the Linux that was originally created by Linus Torvalds with the assistance of developers around the world. It is free to download distribute and edit. Debian Linux is a powerful OS, and it is slowly becoming popular all over the world.