RAM, which is short for Random Access Memory, is a computer storage media which can be accessed considerably faster than a hard drive, because the data can be read randomly, skipping the bytes before the needed info is reached. On a server, the RAM is used to load scripts and web apps after they are executed, so the more RAM you are able to use, the more applications you will be able to run concurrently 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 non permanent storage purposes, as the data is lost when the power is shut off. In case you use a shared web hosting account, the physical memory which your scripts may use may be limited and might change according to what the some other clients on the same machine use. Using a virtual or a dedicated web server, however, you will have a set amount of RAM that won't be used by anybody else even if you don't use it at a given time.