RAM, which means Random Access Memory, is a computer storage media that can be accessed way quicker than a hard disk, because the information 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 programs once they are executed, so the more RAM you may use, the more programs 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 overall performance. In contrast to a disk drive, however, the RAM is used for non permanent storage purposes, due to the fact that the information is lost when the power is shut off. In case you use a shared web hosting account, the physical memory which your scripts could use may be limited and might change based on what the other customers on the same web server use. Through a virtual or a dedicated hosting server, on the other hand, you shall have a set amount of RAM which won't be used by others even when you do not use it at a given time.