Debian is a Linux distribution, which is widely used for desktop machines, yet it has been gaining in popularity as a server OS during the last few years as well. It's very stable and risk-free, due to the fact that fixes are released in just a few days after an issue is discovered. Debian has a huge support community, so if you have any kind of questions or issues with the OS or with some of the 30,000+ packages it is equipped with, you are able to contact the developers immediately through email using special e-mail lists and receive a response in 15-20 minutes. The Debian community supplies the top level of support possible, because your questions will be handled by exactly the same people that built Debian in the first place, so they have a thorough knowledge of how their system functions. Since the Operating System is 100% free to use and distribute, no license charges will be included with your website hosting fees and you'll be able to customize the program code files and any other software which you install without restrictions, to optimize the software environment for your websites. What's more, Debian performs very well on any hardware, because it is light and effective and doesn't require a lot of memory.