A virtual or a dedicated server is a standalone machine, which has its own Os and always keeping the latter up-to-date is a crucial, albeit underrated task. Not only can an update enhance the performance of your sites, but it will also save you lots of issues in the future. An update could be released for several reasons, the most prevalent being to fix recently discovered security holes, which may permit third-party people to access and alter the content you have on the server. You can also see an improved functionality of your web apps as updates might also be released for better compatibility between the Operating System and the configuration it functions on as a way to get the most out of the hardware. Additionally, if you keep your apps up-to-date, they might need a later Operating system version that will have the necessary software dependencies and will enable them to operate adequately.