Debian is the selected Operating System for the following reasons:
Debian is one of the oldest distributions and it is famous because of its stability, any package has been tested thoroughly before included in a Debian stable release.
Debian community is very responsive to bug fixing, security is one of the most important Debian features and this is very convenient for a production server.
Debian has a social contract with the Free Software Community, which means we are free to use any software that suits our needs.