If you get a hosting machine of your own, it will operate independently, so it will have its own Operating System and you can later install server side apps directly or script-driven internet sites via a hosting Cp. Though keeping the Os updated isn't always considered fundamental, it can be a very important task for several reasons. A newer Operating system version may have better support for certain hardware, so you might get better performance for the websites and web apps you install. Your server shall also be more safe because updates usually include security patches which fix small issues which may enable unauthorized people to access your content. Last, but not least, more recent script versions, which are also released for both increased security and for additional features, may require a later version of the Operating System in order to work effectively and with their full capabilities.