RAM is an abbreviation for Random Access Memory. This is a sort of computer memory, which, different from other storage devices like hard disk drives or DVDs, permits the data to be accessed directly without reading the previous content saved inside it. Every time a program is started, it's stored within the RAM, since it could be accessed considerably faster than if it was read from another media device. With regard to the website hosting service itself, additional RAM means that more web apps can operate at the same time on a particular web server, particularly if they're resource-demanding and are accessed by a great number of of people all at once. Unlike a shared web hosting package where the system resources of a certain account could be flexible and sometimes depend on what other users consume also, a VPS features a guaranteed amount of RAM which you can use at all times. That memory is assigned to one server only and won't be used by other clients even in case it's not used.