Debian is a Linux release, that is widespread for desktop machines, but it's been gaining popularity as a server Operating System over the last couple of years as well. It's really stable and secure, because fixes are released in a few days after a problem is discovered. Debian has a vast support community, so when you have any kind of questions or problems with the OS or with some of the 30,000+ packages it features, you can contact the developers right away through email using special mailing lists and receive a reply in 15-20 minutes. The Debian community gives you the top level of support possible, because all of your questions will be handled by the very same people that made Debian in the first place, so they have a detailed 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 web hosting fees and you'll be able to change the program code files and any additional software that you install with no restrictions, to optimize the software environment for your Internet sites. What's more, Debian performs very well on any hardware, as it's light and effective and doesn't need a lot of memory.