RAM, which refers to Random Access Memory, is a computer storage media that can be accessed way quicker than a hard disk drive, as the info can be read randomly, skipping the bytes before the needed info is reached. On a web server, the RAM is employed to load scripts and web programs once they are executed, so the more RAM you can use, the more apps you shall be able to run at the same time and the more people shall be able to check out your websites with no effect on the site’s/server’s functionality. Unlike a disk drive, however, the RAM is used for non permanent storage purposes, because the information is lost once the power is shut off. If you use a shared web hosting account, the physical memory your scripts may use may be limited and may change based upon what the some other clients on the same server use. Using a virtual or a dedicated hosting server, alternatively, you shall have a set amount of RAM which won't be used by anybody else even if you do not use it at a certain time.