If you get a server of your own, it will run independently, so it will have its own Operating System and you could later install server side programs directly or script-driven sites through a hosting Cp. Even though keeping the Operating System updated isn't always considered fundamental, it can be a rather important task for several reasons. A newer OS version might have better support for certain hardware, so you could get better performance for the internet sites and web applications which you install. Your server will also be more secure as updates usually include security patches that deal with small problems which may enable unauthorized people to access your content. Last, but not least, newer script versions, which are also released for both enhanced security and for additional features, may require a later version of the Operating System in order to work properly and with their full capabilities.