Debian is a Linux release, that's widespread for desktop computers, but it has been gaining in popularity as a server Operating System over the last couple of years too. It's very dependable and secure, because fixes are released in a couple of days after a problem is discovered. Debian has a huge support community, so when you have any kind of questions or troubles with the OS or with any of the 30,000+ packages it comes with, you will be able to contact the developers right away through electronic mail using special mailing lists and receive a response in 15-20 minutes. The Debian community gives you the best level of support possible, as all of your questions will be handled by the same people that created Debian in the first place, so they have a thorough knowledge of how their system functions. As the Operating System is free to use and distribute, no license costs will be added to your website hosting fees and you can modify the code files and any additional software which you install without any restrictions, in order to optimize the software environment for your web sites. In addition, Debian performs really well on any hardware, because it's light and quick and doesn't require much memory.