Debian is a Linux release, that's widely used for desktop machines, however it has been gaining popularity as a server OS over the last couple of years too. It's very stable and protected, as fixes are released in a couple of days after an issue is discovered. Debian has a huge support community, so if you have any questions or problems with the OS or with some of the 30,000+ packages it includes, you can contact the developers directly via email using special e-mail lists and receive a reply in just 15-20 minutes. The Debian community provides the best level of support possible, because your questions will be handled by the same people who built Debian in the first place, so they have a thorough knowledge of how their system works. Since the Operating System is free to use and distribute, no license charges will be added to your website hosting fees and you can change the program code files and any additional software that you install with no restrictions, to optimize the software environment for your websites. Furthermore, Debian performs really well on any hardware, because it's light and fast and doesn't require much memory.