RAM is an abbreviation for Random Access Memory. This is a kind of computer memory, that, unlike other storage devices such as hard disk drives or DVDs, permits the data to be accessed directly without reading the previous content stored in it. Whenever an application is started, it is stored in the RAM, as it may be accessed much more quickly than if it was read from another media. With regards to the web hosting service itself, more RAM means that more web applications can work at the same time on a given hosting server, particularly when they're resource-demanding and are accessed by a significant number of people at the same time. In contrast to a shared web hosting package in which the system resources of a given account may be flexible and frequently depend on what other users consume also, a VPS offers a guaranteed amount of RAM that can be used always. That memory is assigned to one web server only and will not be used by other customers even if it's not used.