Debian is a Linux release, that is widespread for desktop computers, however it has been becoming more popular as a server Operating System over the last couple of years as well. It is really stable and protected, since fixes are released in just a couple of days after an issue is discovered. Debian has a vast support community, so if you have any kind of questions or issues with the OS or with any of the 30,000+ packages it includes, you'll be able to contact the developers without delay through email using special mailing lists and receive a reply within 15-20 minutes. The Debian community offers the best level of support possible, since all your questions will be handled by the same people that built Debian in the first place, so they have an exhaustive knowledge of how their system functions. Since the Operating System is absolutely free to use and distribute, no license charges will be included with your website hosting fees and you can change the program code files and any other software that you install with no restrictions, in order to optimize the software environment for your web sites. In addition, Debian performs really well on any kind of hardware, because it is light and quick and doesn't need a lot of memory.