Debian is a popular Linux release, which is used mainly on desktop computers, however numerous people have begun using it lately as a web server OS as well, because of the stability and security it supplies. The latter is a result of the fact that Debian is developed and supported by a large number of qualified volunteers worldwide, which means that any patch that's needed to fix a certain issue is released within a couple of days. The very same community can also help you with any question or problem which a user may ever experience, because they can be contacted via email using mailing lists and a competent response will be sent in no more than 15-20 min. The advantage here is that all your questions will be answered by the same people who have made the Operating System itself and they have an in-depth knowledge of how it works. As Debian is provided for free, you will not have to pay any kind of license fees to use it and you'll be able to personalize it as much as you want or need. This is valid for the Operating System and the 30.000+ software packages that are readily available for it.