Debian is a preferred Linux distribution, which is used mainly on PC's, but many people have begun using it lately as a web server OS as well, because of the stability and protection it provides. The latter is a consequence of the fact that Debian is developed and supported by thousands of qualified volunteers around the globe, so any patch that is required to fix a certain issue is released in a couple of days. The same community will also help you with any question or problem which a user may ever experience, because they can be contacted via electronic mail using e-mail lists and a qualified response will be sent in no more than 15-20 min. The advantage here is that all of your questions will be responded to by the same people who have made the Operating System itself and they have a detailed knowledge of how it functions. As Debian is free, you won't have to pay any license fees to use it and you can personalize it as much as you want or need. This is valid for both the Operating System as well as the 30.000+ software packages that are available for it.