Debian is a Linux distribution, which is preffered for desktop computers, but it's been becoming more popular as a server Operating System during the last few years as well. It's really dependable and risk-free, due to the fact that fixes are released in a few days after an issue is discovered. Debian has a huge support community, so if you have any questions or troubles with the OS or with some of the 30,000+ packages it is equipped with, you are able to contact the developers right away via e-mail using special mailing lists and receive a reply in just 15-20 minutes. The Debian community supplies the best level of support possible, as all your questions will be handled by the very same people that made Debian in the first place, so they have a thorough knowledge of how their system works. Since the Operating System is free to use and distribute, no license charges will be added to your hosting fees and you will be able to modify the program code files and any additional software which you install without restrictions, to optimize the software environment for your websites. In addition, Debian performs very well on any hardware, because it is light and efficient and doesn't require much memory.