If you get a hosting server of your own, it will operate independently, so it'll have its own Operating System and you'll be able to later install server side applications directly or script-driven internet sites via a hosting Cp. Though keeping the Os updated is not always considered an absolute necessity, it can be a really important task for several reasons. A newer Operating system version could have better support for specific hardware, so you might get better performance for the internet sites and web apps that you install. Your server will also be more safe as updates often include security patches that take care of small issues that may enable unauthorized people to access your content. Last, but not least, more recent script versions, which are also released for both boosted security and for additional features, might require a later version of the Os in order to work correctly and with their full capabilities.