RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, that, in contrast to other storage devices such as hard disks or DVDs, enables the information to be accessed directly without reading the previous content stored within it. Each time an application is started, it is stored within the RAM, as it can be accessed considerably quicker than if it was read from another media device. With regards to the hosting service itself, extra RAM means that more web applications can operate at the same time on a given server, particularly when they're resource-demanding and are accessed by a large amount of people at the same time. Unlike a shared web hosting plan where the resources of a particular account can be flexible and frequently depend on what other end users consume also, a VPS features a guaranteed amount of RAM which can be used at all times. That memory is allocated to one hosting server only and shall not be used by other clients even if it's not in use.