Debian is a well-known Linux release, which is used primarily on desktop computers, however a lot of people have started using it lately as a web server Operating System as well, due to the stability and protection it offers. The latter is a direct result the fact that Debian is developed and supported by a large number of qualified volunteers internationally, therefore any patch which is necessary to fix a certain issue is released in a few days. The very same community will also help with any question or problem which 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 all of 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 absolutely free, you will not need 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 the Operating System and the 30.000+ software packages which are available for it.