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 programs directly or script-driven internet sites through a hosting Control Panel. Though keeping the Operating System updated isn't always considered a necessity, it can be a rather important task for a variety of reasons. A newer Operating system version could have better support for specific hardware, so you may get better performance for the sites and web applications which you install. Your server will also be more secure because updates normally include security patches which fix small problems that 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 100 % capabilities.