Debian is a Linux release, that is widely used for desktop computers, yet it's been gaining in popularity as a server Operating System during the last couple of years as well. It is very dependable and secure, because fixes are released within a few days after a problem is discovered. Debian has a vast support community, so if you have any kind of questions or troubles with the OS or with any of the 30,000+ packages it comes with, you'll be able to contact the developers right away through e-mail using special e-mail lists and receive a response in 15-20 minutes. The Debian community supplies the best level of support possible, as all of your questions will be handled by the same people who created Debian in the first place, so they have a thorough knowledge of how their own system works. Since the Operating System is 100% free to use and distribute, no license charges will be added to your web hosting fees and you'll be able to customize the code files and any additional software that you install with no restrictions, to optimize the software environment for your sites. In addition, Debian performs very well on any kind of hardware, as it is light and fast and doesn't require a lot of memory.