Debian is a Linux distribution, that is preffered for desktop computers, but it's been becoming more popular as a server Operating System over the last couple of years as well. It's very dependable and risk-free, because fixes are released in a couple of days after a problem is discovered. Debian has a vast support community, so when you have any kind of questions or troubles with the OS or with some of the 30,000+ packages it includes, you'll be able to contact the developers without delay through email using special mailing lists and receive a reply in 15-20 minutes. The Debian community gives you the best level of support possible, because your questions will be handled by the same people that created Debian in the first place, so they have a thorough knowledge of how their own system functions. Since the Operating System is absolutely free to use and distribute, no license costs will be added to your hosting fees and you will be able to change the program code files and any additional software which you install with no restrictions, in order to optimize the software environment for your Internet sites. What's more, Debian performs really well on any hardware, because it is light and efficient and does not need much memory.