Debian is a Linux release, that is preffered for desktop machines, yet it has been becoming more popular as a server OS over the last couple of years too. It's really dependable and safe, since fixes are released in just a couple of days after a problem is discovered. Debian has a large support community, so if you have any questions or issues with the OS or with any of the 30,000+ packages it comes with, you will be able to contact the developers without delay through electronic mail using special e-mail lists and receive a response within 15-20 min. The Debian community gives you the top level of support possible, as all of your questions will be handled by the very same people who built Debian in the first place, so they have a thorough knowledge of how their system operates. As the Operating System is 100% free to use and distribute, no license costs will be added to your website hosting fees and you'll be able to customize the program code files and any additional software that you install without any restrictions, in order to optimize the software environment for your sites. What's more, Debian performs really well on any kind of hardware, because it is light and fast and does not need much memory.