Debian is a Linux release, that is widely used for desktop computers, but it's been gaining in popularity as a server Operating System over the last few years too. It is really dependable and risk-free, because fixes are released in just a few days after an issue is discovered. Debian has a huge 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 contact the developers without delay through email using special e-mail lists and receive a reply within 15-20 min. The Debian community gives you the top level of support possible, because all your questions will be handled by the same people who created Debian in the first place, so they have an in-depth knowledge of how their own system works. As the Operating System is free to use and distribute, no license charges will be included with your 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. What's more, Debian performs very well on any kind of hardware, as it's light and fast and doesn't require much memory.