What is Debian?

More specifically, Debian:
is a completely open volunteer organization
run on the highest number of architectures (6 released, 4 in development)
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 Standards Base
XFree86
...