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 is among the known linux distribution out there. Debian is known for providing more than a pure OS it comes with over 59000 packages, precompiled ready software bundled up in a nice format for easy installation on your machine.
Who uses Debian any way?
Although debian does not keep precise statistics are available (since Debian does not require users to register), evidence is quite strong that Debian is used by a wide range of organizations, large and small, as well as many thousands of individuals. See our Who's using Debian? page for a list of high-profile organizations which have submitted short descriptions of how and why they use Debian.
So why should you choose debian over other linux distros?
Here are great reasons to choose debian.
Freedom. As stated in the Debian Social Contract, Debian will remain 100% free. Debian is very strict about shipping truly free software. The guidelines used to determine if a work is "free" are provided in The Debian Free Software Guidelines (DFSG).
The Debian package maintenance system The entire system, or any individual component of it, can be upgraded in place without reformatting, without losing custom configuration files, and (in most cases) without rebooting the system. Most Linux distributions available today have some kind of package maintenance system; the Debian package maintenance system is unique and particularly robust.
Open Development Whereas many other Linux distributions are developed by individuals, small, closed groups, or commercial vendors, Debian is a major Linux distribution that is being developed by an association of individuals who have made common cause to create a free operating system, in the same spirit as Linux and other free software.
More than 1343 volunteer package maintainers are working on over 58000 packages and improving Debian GNU/Linux. The Debian developers contribute to the project not by writing new applications (in most cases), but by packaging existing software according to the standards of the project, by communicating bug reports to upstream developers, and by providing user support. See also additional information on how to become a contributor in Chapter 13, Contributing to the Debian Project.
The Universal Operating System: Debian comes with more than 58000 packages and runs on 10 architectures. This is far more than is available for any other GNU/Linux distribution. See Section 5.1, “What types of applications and development software are available for Debian GNU/Linux?” for an overview of the provided software and see Section 4.1, “On what hardware architectures/systems does Debian GNU/Linux run?” for a description of the supported hardware platforms.
The Bug Tracking System: The geographical dispersion of the Debian developers required sophisticated tools and quick communication of bugs and bug-fixes to accelerate the development of the system. Users are encouraged to send bugs in a formal style, which are quickly accessible by WWW archives or via e-mail. See additional information in this FAQ on the management of the bug.
The Debian Policy: Debian has an extensive specification of our standards of quality, the Debian Policy. This document defines the qualities and standards to which we hold Debian packages.
Stability There are many cases of machines that run for over a year without rebooting. Even then, they are only rebooted due to a power failure or a hardware upgrade. Compare that to other systems that crash multiple times a day.