Debian is a well-known Linux release, that's used primarily on PC's, still a lot of people have started using it lately as a web server Operating System as well, because of the stability and protection it offers. The latter is a result of the fact that Debian is developed and supported by numerous qualified volunteers around the globe, therefore any patch that is needed to fix a particular issue is released within a few days. The same community can also help you with any question or problem which a user may ever encounter, because they can be contacted through electronic mail using e-mail lists and a competent response will be sent in around 15-20 minutes. The advantage here is that all of 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 free, you will not need to pay any license fees to use it and you can personalize it as much as you want or need. This is valid for the Operating System and the 30.000+ software packages that are available for it.