Debian is a preferred Linux distribution, that's used primarily on desktop computers, however numerous people have begun using it lately as a web server Operating System 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 worldwide, which means that any patch that's needed to fix a certain issue is released in a few days. The same community can also help with any question or problem which a user may ever have, since 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 your queries will be replied by the same people who have created the Operating System itself and they have a detailed knowledge of how it works. As Debian is absolutely free, you won't need to pay any license fees to use it and you will be able to customize it as much as you want or need. This is valid for the Operating System and the 30.000+ software packages which are available for it.