Debian is a Linux release, that's preffered for desktop computers, but it's been gaining in popularity as a server Operating System during the last couple of years too. It is really stable and secure, since fixes are released within a few days after an issue is discovered. Debian has a large support community, so when you have any questions or troubles with the OS or with any of the 30,000+ packages it comes with, you can contact the developers directly through e-mail using special e-mail lists and receive a reply in 15-20 minutes. The Debian community provides the best 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 an in-depth knowledge of how their own system functions. As the Operating System is absolutely free to use and distribute, no license costs will be included with your hosting fees and you'll be able to modify the program code files and any other software which you install with no restrictions, to optimize the software environment for your Internet sites. Furthermore, Debian performs really well on any kind of hardware, because it is light and efficient and doesn't require much memory.