A virtual or a dedicated server is a standalone machine, that has its own Os and maintaining the latter up-to-date is an important, though underestimated task. Not only can an update enhance the functionality of your sites, but it can also save you a lot of problems in the future. An update could be released for a number of reasons, the most widespread being to fix recently found security holes, which may enable third-party individuals to access and modify the content you have on the hosting machine. You might also see an improved overall performance of your web programs because updates may also be released for better compatibility between the Os and the configuration it functions on so that you can get the most out of the hardware. In addition, if you keep your programs up-to-date, they might need a later Operating system version that will have the needed software dependencies and will permit them to operate effectively.