A virtual or a dedicated server is a standalone machine, that has its own Os and always keeping the latter up-to-date is a crucial, though underestimated task. Not simply can an update enhance the performance of your websites, but it will also save you a lot of problems later on. An update may be released for many different reasons, the most widespread being to fix newly discovered security holes, which may allow third-party individuals to access and modify the content that you have on the hosting machine. You might also see an improved overall performance of your web apps as updates may also be released for better compatibility between the Os and the configuration it functions on so as to get the most out of the hardware. Also, if you keep your applications up-to-date, they may also require a later OS version which will have the required software dependencies and will allow them to function adequately.