RAM, which refers to Random Access Memory, is a computer storage media which may be accessed much quicker than a disk drive, as the information can be read randomly, skipping the bytes before the needed info is reached. On a web server, the RAM is used to load scripts and web apps once they are executed, so the more RAM you can use, the more applications you will be able to run simultaneously and the more people will be able to explore your Internet sites without any effect on the site’s/server’s functionality. Different from a disk drive, however, the RAM is employed for short-term storage purposes, since the information is lost when the power is shut off. In case you use a shared web hosting account, the physical memory your scripts may use may be limited and could change according to what the some other clients on the same web server use. Using a virtual or a dedicated server, however, you'll have a set amount of RAM which won't be used by anybody else even when you don't use it at a certain time.