RAM, which means Random Access Memory, is a computer storage media that can be accessed considerably faster than a hard disk, because the info can be read randomly, skipping the bytes before the needed information is reached. On a web server, the RAM is employed to load scripts and web apps when they are executed, so the more RAM you can use, the more applications you shall be able to run all at once and the more people will be able to surf your websites without any effect on the site’s/server’s overall performance. In contrast to a disk drive, however, the RAM is employed for short-term storage purposes, because the information is lost as soon as the power is shut off. When you use a shared web hosting account, the physical memory your scripts are able to use may be limited and could change based upon what the other customers on the same machine use. With a virtual or a dedicated web server, alternatively, you will have a guaranteed amount of RAM which will not be used by others even when you do not use it at a certain time.