RAM, which means Random Access Memory, is a computer storage media which could be accessed considerably faster than a hard disk drive, because the information can be read randomly, skipping the bytes before the needed information is reached. On a web server, the RAM is employed to load scripts and web programs when they are executed, so the more RAM you can use, the more apps you will be able to run simultaneously and the more people shall be able to check out your websites without any effect on the site’s/server’s overall performance. Different from a disk drive, however, the RAM is employed for momentary storage purposes, since the information is lost when the power is shut off. When you use a shared web hosting account, the physical memory that your scripts may use may be limited and might change depending on what the other customers on the same web server use. Using a virtual or a dedicated hosting server, alternatively, you shall have a guaranteed amount of RAM that will not be used by anybody else even if you do not use it at a given time.