RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, which, in contrast to other storage devices including hard disk drives or DVDs, permits the data to be accessed directly without reading the previous content stored in it. Every time an app is started, it's stored within the RAM, due to the fact that it may be accessed much quicker than if it was read from another media. With regard to the web hosting service itself, additional RAM means that more web apps can work simultaneously on a certain web server, particularly when they are resource-demanding and are accessed by a significant number of people concurrently. Different from a shared web hosting solution in which the resources of a particular account can be flexible and often depend on what other end users consume as well, a VPS includes a guaranteed amount of RAM which can be used all the time. That memory is allotted to one server only and will not be used by other customers even when it's not used.