RAM, which stands for Random Access Memory, is a computer storage media which could be accessed faster than a hard disk, as the data 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 when they are executed, so the more RAM you may use, the more apps you will be able to run all at once and the more people will be able to surf your websites without effect on the site’s/server’s functionality. In contrast to a disk drive, however, the RAM is used for temporary storage purposes, due to the fact that the information is lost as soon as the power is shut off. In case you use a shared web hosting account, the physical memory which your scripts are able to use may be limited and might change based upon what the other customers on the same machine use. With a virtual or a dedicated web server, alternatively, you shall have a guaranteed amount of RAM which won't be used by anyone else even if you don't use it at a particular time.