Debian is a Linux release, which is widely used for desktop computers, yet it has been becoming more popular as a server Operating System during the last couple of years too. It's really dependable and risk-free, because fixes are released within a few 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 can easily contact the developers directly via email using special mailing lists and receive a response within 15-20 minutes. The Debian community provides the top level of support possible, as all your questions will be handled by exactly the same people that created Debian in the first place, so they have an exhaustive knowledge of how their own system works. As the Operating System is free to use and distribute, no license costs will be included with your web hosting fees and you can change the code files and any other software that you install without any restrictions, in order to optimize the software environment for your websites. What's more, Debian performs very well on any kind of hardware, as it is light and quick and doesn't require a lot of memory.