RAM is an abbreviation for Random Access Memory. This is a kind of computer memory, that, different from other storage devices including hard disks or DVDs, enables the information to be accessed directly without reading the previous content located within it. Anytime an app is launched, it's stored within the RAM, as it may be accessed much faster than if it was read from another media device. In terms of the website hosting service itself, more RAM means that more web applications can run all at once on a particular hosting server, particularly if they're resource-demanding and are accessed by a significant number of people all at once. Unlike a shared web hosting solution where the system resources of a certain account can be flexible and often depend on what other end users consume also, a VPS offers a guaranteed amount of RAM which can be used all the time. That memory is allocated to one hosting server only and shall not be used by other clients even in case it is not in use.