RAM is an abbreviation for Random Access Memory. This is a type of computer memory, which, different from other storage devices like hard disk drives or DVDs, enables the info to be accessed directly without reading the previous content saved within it. Whenever an application is launched, it's stored inside the RAM, since it could be accessed much more quickly than if it was read from another media device. With regard to the web hosting service itself, additional RAM means that more web applications can run at the same time on a certain web server, especially when they are resource-demanding and are accessed by a large number of people concurrently. In contrast to a shared web hosting plan where the system resources of a given account could be flexible and frequently depend on what other users consume too, a VPS offers a guaranteed amount of RAM which can be used always. That memory is assigned to one hosting server only and shall not be used by other clients even when it is not used.