RAM is an abbreviation for Random Access Memory. This is a kind of computer memory, that, unlike other storage devices including hard disk drives or DVDs, allows the data to be accessed directly without reading the previous content saved inside it. Every time an app is started, it's stored within the RAM, because it could be accessed considerably faster than if it was read from another media. With regard to the web hosting service itself, extra RAM means that more web applications can work concurrently on a particular hosting server, particularly if they are resource-demanding and are accessed by a great number of of people simultaneously. In contrast to a shared web hosting solution where the system resources of a particular account can be flexible and often depend on what other users consume also, a VPS includes a guaranteed amount of RAM you can use all the time. That memory is assigned to one hosting server only and will not be used by other customers even in case it is not being used.