Debian is a Linux release, which is widespread for desktop computers, however it's been becoming more popular as a server Operating System during the last couple of years too. It is really dependable and secure, because fixes are released in a couple of days after an issue is discovered. Debian has a huge support community, so when you have any kind of questions or issues with the OS or with any of the 30,000+ packages it features, you will be able to contact the developers right away through e-mail using special mailing lists and receive a reply in 15-20 minutes. The Debian community provides the top level of support possible, since all your questions will be handled by the same people that created Debian in the first place, so they have an in-depth knowledge of how their system operates. Because the Operating System is 100% free to use and distribute, no license charges will be added to your web hosting fees and you can change the code files and any other software that you install without restrictions, in order to optimize the software environment for your websites. In addition, Debian performs really well on any kind of hardware, as it is light and efficient and does not need much memory.