RAM, which is short for Random Access Memory, is a computer storage media which may be accessed much more quickly than a hard drive, because the info can be read randomly, skipping the bytes before the needed info is reached. On a web server, the RAM is used to load scripts and web programs when they are executed, so the more RAM you may use, the more apps you'll be able to run all at once and the more people shall be able to check out your Internet sites with no effect on the site’s/server’s performance. Different from a disk drive, however, the RAM is used for temporary storage purposes, due to the fact that the info is lost when the power is shut off. If you use a shared web hosting account, the physical memory which your scripts could use may be limited and could change based on what the some other clients on the same server use. With a virtual or a dedicated web server, on the other hand, you shall have a set amount of RAM which won't be used by anyone else even when you don't use it at a certain time.