Debian is a well-known Linux release, that is used mainly on desktop computers, still a lot of people have begun using it lately as a web server OS as well, due to the stability and protection it offers. The latter is a result of the fact that Debian is developed and supported by countless qualified volunteers around the globe, so that any patch that's necessary to fix a particular issue is released in a matter of days. The 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 via electronic mail using mailing lists and a competent response will be sent in around 15-20 min. The advantage here is that your questions 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 provided for free, you won't have to pay any kind of license fees to use it and you will be able to personalize 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.