RAM, which means Random Access Memory, is a computer storage media which may be accessed much more quickly than a hard disk, because the info can be read randomly, skipping the bytes before the needed data is reached. On a server, the RAM is used to load scripts and web programs after they are executed, so the more RAM you can use, the more apps you shall be able to run at the same time and the more people shall be able to explore your Internet sites without any effect on the site’s/server’s functionality. Unlike a disk drive, however, the RAM is employed for non permanent storage purposes, due to the fact that the data is lost when the power is shut off. In case you use a shared web hosting account, the physical memory which your scripts can use may be limited and could change depending on what the some other clients on the same machine use. Through a virtual or a dedicated web server, however, you will 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.