Debian is a popular Linux release, which is used primarily on desktop computers, however many people have begun using it lately as a web server OS too, due to the stability and protection it supplies. The latter is a result of the fact that Debian is developed and supported by countless qualified volunteers internationally, so any patch which is required to fix a certain issue is released in a couple of days. The same community will also help you with any question or issue that a user may ever experience, as they can be contacted through email using mailing lists and a qualified response will be sent in around 15-20 minutes. The advantage here is that your queries will be responded to by the same people who have made the Operating System itself and they have a detailed knowledge of how it functions. As Debian is free, you will not need to pay any license fees to use it and you will be able to personalize it as much as you want or need. This is valid for the Operating System as well as the 30.000+ software packages which are available for it.