RAM, that refers to Random Access Memory, is a computer storage media that can be accessed much quicker than a disk drive, due to the fact that the info can be read randomly, skipping the bytes before the needed info is reached. On a hosting server, the RAM is employed to load scripts and web apps once they are executed, so the more RAM you may use, the more apps you'll be able to run simultaneously and the more people will be able to check out your websites without any effect on the site’s/server’s general performance. In contrast to a disk drive, however, the RAM is employed for short-term storage purposes, as the info is lost when the power is shut off. If you use a shared web hosting account, the physical memory your scripts could use may be limited and can change based upon what the other customers on the same machine use. With a virtual or a dedicated hosting server, alternatively, you shall have a fixed amount of RAM which won't be used by others even if you don't use it at a given time.