RAM is an abbreviation for Random Access Memory. This is a type of computer memory, that, in contrast to other storage devices like hard disks or DVDs, enables the info to be accessed directly without reading the previous content stored in it. Each time an app is started, it's stored inside the RAM, due to the fact that it can be accessed considerably faster than if it was read from another media device. In terms of the web hosting service itself, additional RAM means that more web apps can run concurrently on a given web server, particularly if they are resource-demanding and are accessed by a significant number of people all at once. In contrast to a shared web hosting plan where the system resources of a particular account could be flexible and quite often depend on what other end users consume too, a VPS includes a guaranteed amount of RAM that can be used always. That memory is allocated to one hosting server only and shall not be used by other clients even in case it's not being used.