RAM, that is short for Random Access Memory, is a computer storage media which is accessed considerably faster than a hard drive, due to the fact that the information 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 applications you'll be able to run all at once and the more people shall be able to explore your sites without any effect on the site’s/server’s overall performance. Unlike a disk drive, however, the RAM is employed for temporary storage purposes, since the information is lost once the power is shut off. In case you use a shared web hosting account, the physical memory that your scripts are able to use may be limited and may change based on what the some other clients on the same machine use. Using a virtual or a dedicated hosting server, alternatively, you shall have a fixed amount of RAM which won't be used by anybody else even when you don't use it at a particular time.
