Debian is a well-known Linux release, that's used primarily on desktop machines, but lots of people have started using it lately as a web server Operating System too, due to the stability and protection it supplies. The latter is a direct result the fact that Debian is developed and supported by thousands of qualified volunteers all around the world, so that any patch which is needed to fix a particular issue is released in a matter of days. The same community can also help with any question or trouble that a user may ever experience, since they can be contacted through email 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 addressed 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 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 as well as the 30.000+ software packages that are readily available for it.