Debian is a widespread Linux release, which is used mainly on personal computers, still lots of people have begun using it lately as a web server OS too, due to the stability and protection it supplies. The latter is a consequence of the fact that Debian is developed and supported by thousands of qualified volunteers around the globe, which means that any patch that is needed to fix some issue is released within a few days. The very same community will also help with any question or issue which a user may ever have, due to the fact that they can be contacted through email using e-mail lists and a competent response will be sent in no more than 15-20 minutes. The advantage here is that your queries will be answered by the same people who have designed the Operating System itself and they have an in-depth knowledge of how it functions. As Debian is free, you won't need to pay any kind of license fees to use it and you will be able to customize it as much as you want or need. This is valid for both the Operating System and the 30.000+ software packages which are readily available for it.