RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, which, in contrast to other storage devices such as hard disk drives or DVDs, permits the info to be accessed directly without reading the previous content saved in it. Each time an application is launched, it is stored within the RAM, since it could be accessed much more quickly than if it was read from another media. In terms of the hosting service itself, extra RAM means that more web apps can operate simultaneously on a certain hosting server, especially if they're resource-demanding and are accessed by a great number of of people concurrently. Different from a shared web hosting plan in which the system resources of a particular account may be flexible and frequently depend on what other end users consume too, a VPS features a guaranteed amount of RAM that can be used always. That memory is allotted to one web server only and will not be used by other customers even if it is not in use.