Debian is a well-known 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 too, due to the stability and protection it offers. The latter is a consequence of the fact that Debian is developed and supported by a large number of qualified volunteers internationally, therefore any patch that's necessary to fix a certain issue is released in a few days. The very same community will also help with any question or issue which a user may ever have, because they can be contacted through email using mailing lists and a competent response will be sent in no more than 15-20 minutes. The advantage here is that all your queries will be replied by the same people who have developed the Operating System itself and they have a detailed knowledge of how it works. As Debian is provided for free, you will not have to pay any license fees to use it and you'll be able to 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 readily available for it.