Debian is an OS that uses the Linux kernel. Although it is usually set up on desktop computers, it's being used on a growing number of web servers too. The reason is that it's really stable, so a server running it won't have to be restarted for months. Debian is also regarded as being among the most protected Operating Systems to be found, as security patches are released within days after an issue is discovered. This is possible because thousands of skilled developers are employed by the Debian project on a voluntary basis and not only do they work on the OS itself, but they also provide 24/7 support by using special mailing lists and reply within 20 minutes to any question. In this light, you'll receive top-notch support directly from the developers who know their own platform in detail, and not from a third-party support team. Debian is also one of the Linux distributions with the highest number of packages - over 30,000. Since the Operating System is completely free to use, you can modify both the core and all the packages in any way you see fit. In addition, you will not have to pay any kind of license fees.