RAM, which means Random Access Memory, is a computer storage media which can be accessed faster than a hard drive, due to the fact that the info can be read randomly, skipping the bytes before the needed info is reached. On a hosting server, the RAM is used to load scripts and web apps when they are executed, so the more RAM you are able to use, the more applications you will be able to run simultaneously and the more people shall be able to explore your sites without effect on the site’s/server’s overall performance. Different from a disk drive, however, the RAM is employed for short-term storage purposes, as the information is lost as soon as the power is shut off. When you use a shared web hosting account, the physical memory which your scripts are able to use may be limited and could change depending on what the some other clients on the same hosting server use. Using a virtual or a dedicated hosting server, however, you'll have a fixed amount of RAM which won't be used by anyone else even if you do not use it at a given time.