Debian is a Linux distribution, that's widespread for desktop machines, however it has been gaining in popularity as a server Operating System during the last few years as well. It is really stable and safe, because fixes are released within a couple of days after a problem is discovered. Debian has a vast support community, so if you have any kind of questions or issues with the OS or with some of the 30,000+ packages it includes, you can easily contact the developers without delay through electronic mail using special mailing lists and receive a response in 15-20 min. The Debian community gives you the top level of support possible, since your questions will be handled by exactly the same people that made Debian in the first place, so they have an exhaustive knowledge of how their system works. Since the Operating System is absolutely free to use and distribute, no license costs will be included with your website hosting fees and you will be able to modify the program code files and any other software that you install without any restrictions, to optimize the software environment for your Internet sites. What's more, Debian performs very well on any hardware, as it is light and efficient and doesn't need a lot of memory.