Debian is a Linux release, which is widespread for desktop machines, but it's been becoming more popular as a server OS during the last couple of years as well. It is very dependable and safe, since fixes are released within a couple of days after a problem is discovered. Debian has a vast support community, so when you have any kind of questions or issues with the OS or with some of the 30,000+ packages it includes, you can contact the developers right away via email using special e-mail lists and receive a reply in just 15-20 min. The Debian community offers the best level of support possible, since all of your questions will be handled by the same people that created Debian in the first place, so they have a detailed knowledge of how their system operates. As the Operating System is 100% free to use and distribute, no license costs will be included with your web hosting fees and you will be able to change the code files and any other software that you install without any restrictions, to optimize the software environment for your Internet sites. Furthermore, Debian performs very well on any hardware, as it's light and efficient and doesn't require a lot of memory.