RAM, that means Random Access Memory, is a computer storage media that could be accessed considerably faster than a hard disk drive, due to the fact that the info can be read randomly, skipping the bytes before the needed information is reached. On a hosting server, the RAM is used to load scripts and web programs once they are executed, so the more RAM you may use, the more apps you'll be able to run at the same time and the more people shall be able to browse your Internet sites without any effect on the site’s/server’s functionality. Unlike 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. In case you use a shared web hosting account, the physical memory which your scripts are able to use may be limited and may change based on what the some other clients on the same machine use. With a virtual or a dedicated hosting server, alternatively, you will have a set amount of RAM which will not be used by anybody else even if you don't use it at a certain time.