Debian GNU/Linux is an open source Linux operating system build from scratch by a team of talented developers and hackers who wanted to create an alternative to existing Linux distributions, such as Slackware. Dubbed “The Universal Operating System,” Debian GNU/Linux is used as a base for hundreds, if not thousands, of Linux distributions, including the world’s most popular free operating system, Ubuntu Linux.
Distributed primarily as installable-only ISO images
It is distributed as network install images or installable-only CD or DVD ISO images, supporting the 64-bit (amd64, kfreebsd-amd64, ia64), 32-bit (i386, kfreebsd-i386), Armel, Armhf, MIPS, PowerPC, SPARC, s390, s390x, and MIPSel architectures.
Multi-arch ISO images are also available for download, but they only support network installations. Recent versions of the operating system are distributed with the KDE, Xfce and LXDE desktop environments.