RAM, which is short for Random Access Memory, is a computer storage media that may be accessed faster than a hard disk, due to the fact that the information can be read randomly, skipping the bytes before the needed information is reached. On a server, the RAM is employed to load scripts and web apps once they are executed, so the more RAM you are able to use, the more programs you shall be able to run simultaneously and the more people shall be able to look through your sites with no effect on the site’s/server’s performance. Unlike a disk drive, however, the RAM is employed for momentary storage purposes, because the info is lost once 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 could change based on what the other customers on the same server use. With a virtual or a dedicated web server, alternatively, you shall have a guaranteed amount of RAM which will not be used by anybody else even if you don't use it at a given time.