RAM is an abbreviation for Random Access Memory. This is a kind of computer memory, which, different from other storage devices like hard disks or DVDs, allows the info to be accessed directly without reading the previous content located inside it. Each time a program is launched, it is stored within the RAM, due to the fact that it may be accessed much more quickly than if it was read from another media. With regard to the web hosting service itself, extra RAM means that more web apps can operate concurrently on a certain web server, especially when they are resource-demanding and are accessed by a significant number of people concurrently. Unlike a shared web hosting solution in which the system resources of a particular account could be flexible and frequently depend on what other users consume too, a VPS features a guaranteed amount of RAM you can use all the time. That memory is assigned to one web server only and won't be used by other clients even in case it's not used.