RAM, that is short for Random Access Memory, is a computer storage media which is accessed much quicker than a disk drive, simply because the info can be read randomly, skipping the bytes before the needed information is reached. On a web server, the RAM is used to load scripts and web programs after they are executed, so the more RAM you are able to use, the more programs you will be able to run all at once and the more people shall be able to browse your websites without effect on the site’s/server’s functionality. Unlike a disk drive, however, the RAM is employed for temporary storage purposes, since the info is lost once the power is shut off. In case you use a shared web hosting account, the physical memory your scripts could use may be limited and may change based upon what the other customers on the same hosting server use. Through a virtual or a dedicated hosting server, however, you shall have a guaranteed amount of RAM which will not be used by anyone else even if you do not use it at a particular time.