If you get a server of your own, it will run independently, so it'll have its own Operating System and you can later install server side applications directly or script-driven sites through a hosting Cp. Even though keeping the Operating System updated is not always considered an absolute necessity, it can be a really important task for a number of reasons. A more modern Operating system version may have better support for specific hardware, so you may get better performance for the sites and web applications that you install. Your server will also be more protected since updates often include security patches that fix small problems which may permit unauthorized individuals to access your content. Last, but not least, more recent script versions, which are also released for both improved security and for additional features, may require a later version of the Operating System in order to work properly and with their 100 % capabilities.