If you get a hosting server of your own, it will run independently, so it will have its own Os and you can later install server side apps directly or script-driven websites via a hosting Cp. Even though keeping the Operating System updated is not always considered an absolute necessity, it can be a quite important task for several reasons. A newer Operating system version could have better support for certain hardware, so you could get better performance for the sites and web applications that you install. Your server shall also be more safe as updates usually include security patches that fix small issues that may permit unauthorized people to access your content. Last, but not least, more modern script versions, which are also released for both boosted security and for additional features, may need a later version of the Os in order to work correctly and with their 100 % capabilities.