Debian is a GNU/Linux distribution.

If you use Debian, you tend to love Debian.

Why?

• It's noncommercial: it's not controlled by a corporate entity.
• apt-get: to install anything you just type apt-get install [package? and you're away. Dependencies are all handled for you. No more rabbiting around the internet for an RPM that might do what you want it to do...
• It runs on LOTS of platforms: i386, Motorola 68k, Alpha, Sparc, PowerPC, ARM, MIPS, HP PA-RISC, IA64 (Itanium) and S390
• It's incredibly easy to maintain: apt-get upgrade every night and you'll be running the latest versions of everything.
• It's very true to Linux: some purists dont like RedHat's directory structures.

debian.org have a FAQ online at http://www.debian.org/doc/FAQ/; we have a local DebianFaq?.

There are some reasons not to like Debian, the most obvious of which is that packages have to be uploaded into the repository before you can get them. You can always install things from source, or use other peoples' 'experimental' .deb sources just by changing your AptSourcesList.