What is Debian?

More specifically, Debian:
is a completely open volunteer organization
run on a large number of architectures (6 released)
is quite international
is one of the most popular GNU/Linux distributions
is the largest GNU/Linux distribution (3901 packages)
works with companies to develop and maintain software
is focused on Freedom
is well represented in the free software world
Free Standards Group
Gnome Foundation board
Linux International
Linux Professional Institute
Linux Standards Base
XFree86
...