RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, that, in contrast to other storage devices including hard disks or DVDs, enables the info to be accessed directly without reading the previous content stored inside it. Anytime an app is launched, it's stored inside the RAM, due to the fact that it can be accessed much faster than if it was read from another media. In terms of the web hosting service itself, more RAM means that more web apps can run at the same time on a certain server, particularly when they're resource-demanding and are accessed by a large amount of people all at once. Different from a shared web hosting solution in which the system resources of a given account could be flexible and frequently depend on what other users consume as well, a VPS includes a guaranteed amount of RAM that can be used always. That memory is allocated to one server only and won't be used by other customers even if it is not in use.