Debian is a Linux distribution, which is preffered for desktop computers, but it has been becoming more popular as a server Operating System over the last few years as well. It is very dependable and risk-free, because fixes are released in a few days after an issue is discovered. Debian has a large support community, so when you have any kind of questions or troubles with the OS or with some of the 30,000+ packages it comes with, you can contact the developers straight away through e-mail using special e-mail lists and receive a reply in 15-20 minutes. The Debian community offers the top level of support possible, as all your questions will be handled by the same people that built Debian in the first place, so they have a detailed knowledge of how their own system operates. As the Operating System is absolutely free to use and distribute, no license costs will be added to your website hosting fees and you will be able to modify the code files and any additional software which you install without restrictions, so as to optimize the software environment for your Internet sites. In addition, Debian performs really well on any hardware, as it's light and quick and does not need much memory.