RAM is an abbreviation for Random Access Memory. This is a type of computer memory, that, different from other storage devices including hard disks or DVDs, enables the data to be accessed directly without reading the previous content stored within it. Each time an app is started, it's stored within the RAM, because it may be accessed considerably quicker than if it was read from another media. With regard to the website hosting service itself, additional RAM means that more web apps can run simultaneously on a given web server, particularly if they are resource-demanding and are accessed by a great number of of people simultaneously. Unlike a shared web hosting solution where the system resources of a certain account could be flexible and frequently depend on what other users consume too, a VPS offers a guaranteed amount of RAM you can use at all times. That memory is assigned to one hosting server only and shall not be used by other customers even when it's not in use.