Debian is a widespread Linux release, that is used primarily on desktop computers, still numerous people have started using it lately as a web server OS as well, due to the stability and protection it provides. The latter is a consequence of the fact that Debian is developed and supported by thousands of qualified volunteers around the globe, so that any patch which is required to fix a certain issue is released in a few days. The very same community can also help with any question or issue that a user may ever encounter, as they can be contacted through e-mail using mailing lists and a qualified response will be sent in no more than 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 an in-depth knowledge of how it functions. As Debian is absolutely free, you won't need to pay any kind of license fees to use it and you'll be able to personalize it as much as you want or need. This is valid for both the Operating System as well as the 30.000+ software packages that are readily available for it.