RAM, which stands for Random Access Memory, is a computer storage media which could be accessed noticeably faster than a disk drive, because the information can be read randomly, skipping the bytes before the needed info is reached. On a hosting server, the RAM is employed to load scripts and web applications when they are executed, so the more RAM you are able to use, the more applications you will be able to run at the same time and the more people will be able to surf your sites with no effect on the site’s/server’s general performance. Unlike a disk drive, however, the RAM is employed for momentary storage purposes, because the data is lost the moment the power is shut off. If you use a shared web hosting account, the physical memory that 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 web server, on the other hand, you shall have a guaranteed amount of RAM which won't be used by others even if you do not use it at a particular time.