If you get a hosting server of your own, it will work independently, so it'll have its own Operating System and you can later install server side programs directly or script-driven internet sites through a hosting Cp. Though keeping the Os updated is not always considered an absolute necessity, it can be a very important task for a variety of reasons. A newer Operating system version might have better support for certain hardware, so you may get better performance for the sites and web apps which you install. Your server shall also be more secure because updates typically include security patches which deal with small problems which may permit unauthorized people to access your content. Last, but not least, newer script versions, which are also released for both improved security and for additional features, may need a later version of the Operating System in order to work properly and with their full capabilities.