Debian is a well-known Linux distribution, that is used primarily on personal computers, however a lot of people have begun using it lately as a web server OS too, due to the stability and security 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 particular issue is released in a matter of days. The very same community can also help with any question or trouble that a user may ever have, as they can be contacted through e-mail using mailing lists and a qualified 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 developed the Operating System itself and they have an in-depth knowledge of how it functions. As Debian is absolutely free, you will not need to pay any kind of license fees to use it and you can customize 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.