Debian is a widespread Linux distribution, which is used primarily on PC's, 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 supplies. The latter is a result of the fact that Debian is developed and supported by a large number of qualified volunteers around the globe, which means that any patch that is required to fix a certain issue is released in a matter of days. The same community can also help you with any question or issue which a user may ever experience, due to the fact that they can be contacted through electronic mail using e-mail lists and a competent response will be sent in around 15-20 minutes. The advantage here is that your queries will be answered by the same people who have designed the Operating System itself and they have a detailed knowledge of how it functions. As Debian is absolutely free, you will not have 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 both the Operating System and the 30.000+ software packages which are available for it.