Debian is a popular Linux release, which is used primarily on desktop machines, but a lot of people have started using it lately as a web server OS too, because of the stability and protection it supplies. The latter is a consequence of the fact that Debian is developed and supported by thousands of qualified volunteers internationally, which means that any patch that is required to fix a certain issue is released in a matter of days. The same community will also help with any question or trouble which a user may ever experience, due to the fact that they can be contacted through e-mail using mailing lists and a competent response will be sent in around 15-20 minutes. The advantage here is that your queries will be addressed by the same people who have made the Operating System itself and they have a detailed knowledge of how it functions. As Debian is provided for free, you will not have to pay any kind of 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 and the 30.000+ software packages which are readily available for it.