Debian is a Linux release, that's preffered for desktop computers, but it's been becoming more popular as a server Operating System during the last few years too. It is very stable and secure, because fixes are released in just a couple of days after a problem is discovered. Debian has a large support community, so when you have any kind of questions or troubles with the OS or with any of the 30,000+ packages it includes, you'll be able to contact the developers immediately via e-mail using special mailing lists and receive a reply in 15-20 minutes. The Debian community provides the top level of support possible, because all of your questions will be handled by the same people who made Debian in the first place, so they have a thorough knowledge of how their own system works. Since the Operating System is 100% free to use and distribute, no license costs will be included with your web hosting fees and you will be able to customize the code files and any additional software that you install without any restrictions, to optimize the software environment for your Internet sites. In addition, Debian performs very well on any hardware, as it is light and effective and does not require much memory.