RAM is an abbreviation for Random Access Memory. This is a type of computer memory, which, different from other storage devices like hard disks or DVDs, enables the information to be accessed directly without reading the previous content saved inside it. Each time an app is launched, it's stored within the RAM, due to the fact that it could be accessed considerably quicker than if it was read from another media device. With regards to the web hosting service itself, more RAM means that more web apps can operate at the same time on a given web server, especially if they're resource-demanding and are accessed by a great number of of people all at once. Different from a shared web hosting package where the resources of a certain account can be flexible and sometimes depend on what other users consume also, a VPS has a guaranteed amount of RAM which you can use always. That memory is allotted to one hosting server only and will not be used by other clients even in case it is not being used.