RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, that, in contrast to other storage devices including hard disk drives or DVDs, permits the information to be accessed directly without reading the previous content saved inside it. Each time an app is started, it's stored within the RAM, since it can be accessed much more quickly than if it was read from another media device. With regards to the website hosting service itself, additional RAM means that more web apps can operate concurrently on a certain hosting server, especially when they're resource-demanding and are accessed by a great number of of people simultaneously. In contrast to a shared web hosting solution in which the resources of a given account could be flexible and sometimes depend on what other end users consume also, a VPS includes a guaranteed amount of RAM which can be used at all times. That memory is allotted to one hosting server only and shall not be used by other clients even when it is not in use.