RAM, which stands for Random Access Memory, is a computer storage media which is accessed much more quickly than a hard disk drive, as the information can be read randomly, skipping the bytes before the needed information is reached. On a hosting server, the RAM is employed 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 will be able to look through your Internet sites without effect on the site’s/server’s performance. Different from a disk drive, however, the RAM is employed for momentary storage purposes, as the data is lost as soon as the power is shut off. In case you use a shared web hosting account, the physical memory your scripts are able to use may be limited and may change based on what the other customers on the same hosting server use. Using a virtual or a dedicated hosting server, on the other hand, you shall have a set amount of RAM which will not be used by others even when you don't use it at a given time.