Debian is a Linux distribution, which is widespread for desktop computers, yet it has been gaining in popularity as a server OS over the last couple of years as well. It's very dependable and secure, because fixes are released in a couple of days after a problem is discovered. Debian has a large support community, so if you have any questions or issues with the OS or with some of the 30,000+ packages it includes, you are able to contact the developers right away via email using special e-mail lists and receive a reply in just 15-20 minutes. The Debian community gives you the best level of support possible, because your questions will be handled by the very same people that built Debian in the first place, so they have an exhaustive knowledge of how their own system functions. Because the Operating System is absolutely free to use and distribute, no license costs will be added to your hosting fees and you can customize the program code files and any additional software that you install without restrictions, in order to optimize the software environment for your websites. Furthermore, Debian performs really well on any kind of hardware, because it's light and effective and does not need a lot of memory.