RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, which, unlike other storage devices including harddrives or DVDs, permits the info to be accessed directly without reading the previous content located in it. Whenever an app is started, it's stored inside the RAM, as it could be accessed much more quickly than if it was read from another media device. In terms of the website hosting service itself, more RAM means that more web apps can run concurrently on a particular server, particularly if they're resource-demanding and are accessed by a significant number of people simultaneously. In contrast to a shared web hosting package where the resources of a particular account could be flexible and sometimes depend on what other end users consume as well, a VPS provides a guaranteed amount of RAM that can be used always. That memory is allotted to one web server only and shall not be used by other customers even in case it is not used.