RAM, that means Random Access Memory, is a computer storage media that could be accessed much more quickly than a disk 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 programs after they are executed, so the more RAM you are able to use, the more apps you will be able to run all at once and the more people shall be able to check out your sites without effect on the site’s/server’s general performance. In contrast to a disk drive, however, the RAM is employed for momentary storage purposes, because the information is lost the moment the power is shut off. In case you use a shared web hosting account, the physical memory your scripts are able to use may be limited and can change according to what the some other clients on the same machine use. With a virtual or a dedicated web server, alternatively, you'll have a fixed amount of RAM that won't be used by others even if you don't use it at a certain time.