RAM is an abbreviation for Random Access Memory. This is a kind of computer memory, which, unlike other storage devices like harddrives or DVDs, permits the data to be accessed directly without reading the previous content saved within it. Every time an application is launched, it's stored within the RAM, as it may be accessed considerably quicker than if it was read from another media. With regards to the hosting service itself, more RAM means that more web apps can run all at once on a certain web server, particularly when they are resource-demanding and are accessed by a significant number of people concurrently. In contrast to a shared web hosting plan in which the resources of a certain account may be flexible and sometimes depend on what other users consume too, a VPS features a guaranteed amount of RAM which you can use always. That memory is assigned to one web server only and will not be used by other customers even when it is not in use.