What is GNU?
The GNU Project, pronounced “guh-noo”, was launched in 1984 to develop a complete UNIX style operating system which is comprised of free software: the GNU system. Variants of the GNU operating system, which use the Linux kernel, are now widely used.
The GNU project is closely linked to the philosophy of free software, which is central to the projects that derive from it.
You can find out more about GNU from http://gnu.org