Debian is a free operating system (OS) for your computer. An operating
system is the set of basic programs and utilities that make your
computer run. Debian uses the Linux kernel (the core of an operating
system), but most of the basic OS tools come from the GNU project;
hence the name GNU/Linux.
Debian GNU/Linux provides more than a pure OS: it comes with more than
8710 packages, precompiled software bundled up in a nice format for
easy installation on your machine.