RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, which, in contrast to other storage devices like harddrives or DVDs, permits the data to be accessed directly without reading the previous content located inside it. Whenever an app is started, it is stored within the RAM, because it could be accessed considerably quicker than if it was read from another media. In terms of the web hosting service itself, extra RAM means that more web applications can operate all at once on a certain server, particularly when they are resource-demanding and are accessed by a significant number of people at the same time. Unlike a shared web hosting plan where the system resources of a certain account may be flexible and frequently depend on what other users consume also, a VPS has a guaranteed amount of RAM that can be used at all times. That memory is assigned to one web server only and will not be used by other clients even when it is not in use.