If you get a server of your own, it will work independently, so it will have its own Operating System and you'll be able to later install server side programs directly or script-driven internet sites via a hosting Cp. Although keeping the Operating System updated is not always considered a necessity, it can be a very important task for a variety of reasons. A more modern Operating system version might have better support for certain hardware, so you may get better performance for the sites and web applications which you install. Your server shall also be more safe since updates often include security patches that resolve small issues that may permit 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 need a later version of the Operating System in order to work correctly and with their full capabilities.