Debian is a Linux release, which is preffered for desktop computers, however it's been gaining popularity as a server OS during the last few years as well. It is 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 problems with the OS or with any of the 30,000+ packages it is equipped with, you are able to contact the developers right away through email using special mailing lists and receive a response within 15-20 min. The Debian community gives you the top level of support possible, because all of your questions will be handled by the very same people who made Debian in the first place, so they have a detailed knowledge of how their own system works. Because the Operating System is absolutely free to use and distribute, no license costs will be included with your hosting fees and you can customize the program code files and any other software that you install with no restrictions, so as to optimize the software environment for your websites. What's more, Debian performs really well on any kind of hardware, as it's light and quick and does not need much memory.