Debian is a Linux release, which is widely used for desktop machines, but it's been becoming more popular as a server Operating System over the last few years too. It's really stable and secure, as fixes are released in a couple of days after an issue is discovered. Debian has a vast support community, so when you have any kind of questions or issues with the OS or with any of the 30,000+ packages it comes with, you're able to contact the developers right away through electronic mail using special e-mail lists and receive a response within 15-20 min. The Debian community offers the top level of support possible, since all of your questions will be handled by the very same people who built Debian in the first place, so they have an exhaustive knowledge of how their system functions. As the Operating System is 100% free to use and distribute, no license costs will be included with your website hosting fees and you will be able to customize the program code files and any additional software that you install without restrictions, so as to optimize the software environment for your Internet sites. Furthermore, Debian performs very well on any kind of hardware, as it is light and effective and doesn't need a lot of memory.