Debian is a widespread Linux release, which is used primarily on desktop computers, still a lot of people have begun using it lately as a web server Operating System as well, because of the stability and security it offers. The latter is a result of the fact that Debian is developed and supported by thousands of qualified volunteers internationally, so any patch that is necessary to fix a certain issue is released within a few days. The very same community can also help you with any question or problem which a user may ever have, due to the fact that they can be contacted through electronic mail using e-mail lists and a competent response will be sent in no more than 15-20 min. The advantage here is that your queries will be answered by the same people who have created the Operating System itself and they have a detailed knowledge of how it works. As Debian is provided for free, you won't need to pay any license fees to use it and you can personalize it as much as you want or need. This is valid for the Operating System as well as the 30.000+ software packages which are readily available for it.