Debian is a Linux release, that's widely used for desktop machines, but it's been gaining popularity as a server Operating System during the last couple of years too. It is very stable and protected, due to the fact that fixes are released in a few days after a problem is discovered. Debian has a huge support community, so when you have any questions or problems with the OS or with some of the 30,000+ packages it comes with, you can contact the developers straight away via email using special e-mail lists and receive a response in 15-20 min. The Debian community supplies the top level of support possible, because all your questions will be handled by exactly the same people who built Debian in the first place, so they have a thorough knowledge of how their own system operates. Because the Operating System is 100% free to use and distribute, no license charges will be added to your web hosting fees and you'll be able to change the program code files and any other software that you install without restrictions, so as to optimize the software environment for your web sites. Furthermore, Debian performs really well on any hardware, as it is light and quick and doesn't need much memory.