Debian is a well-known Linux release, that is used mainly on desktop computers, still lots of people have begun using it lately as a web server OS too, due to the stability and protection it provides. The latter is a consequence of the fact that Debian is developed and supported by numerous qualified volunteers internationally, which means that any patch which is needed to fix a particular issue is released in a matter of days. The very same community will also help you with any question or issue that a user may ever encounter, due to the fact that they can be contacted via e-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 responded to 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 will be able to customize 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 available for it.