RAM is an abbreviation for Random Access Memory. This is a type of computer memory, that, in contrast to other storage devices including hard disk drives or DVDs, allows the data to be accessed directly without reading the previous content stored within it. Every time an app is launched, it is stored within the RAM, since it may be accessed much more quickly than if it was read from another media device. With regards to the hosting service itself, more RAM means that more web apps can run at the same time on a certain hosting server, particularly if they are resource-demanding and are accessed by a large number of people concurrently. In contrast to a shared web hosting solution where the system resources of a certain account can be flexible and frequently depend on what other users consume too, a VPS offers a guaranteed amount of RAM which can be used always. That memory is allocated to one server only and will not be used by other customers even if it's not in use.