RAM, which stands for Random Access Memory, is a computer storage media which can be accessed way quicker than a hard drive, due to the fact that the information can be read randomly, skipping the bytes before the needed info is reached. On a 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 will be able to run concurrently and the more people shall be able to check out your websites without effect on the site’s/server’s overall performance. In contrast to a disk drive, however, the RAM is used for temporary storage purposes, as the data is lost the moment the power is shut off. If you use a shared web hosting account, the physical memory which your scripts are able to use may be limited and may change according to what the other customers on the same hosting server use. With a virtual or a dedicated web server, however, you will have a set amount of RAM which will not be used by others even if you don't use it at a particular time.