RAM, that refers to Random Access Memory, is a computer storage media that is accessed way quicker than a hard drive, as the information can be read randomly, skipping the bytes before the needed info is reached. On a web server, the RAM is employed to load scripts and web apps after they are executed, so the more RAM you can use, the more programs you shall be able to run concurrently and the more people will be able to look through your Internet sites with no effect on the site’s/server’s overall performance. Unlike a disk drive, however, the RAM is employed for non permanent storage purposes, due to the fact that the information is lost when the power is shut off. If you use a shared web hosting account, the physical memory that your scripts can use may be limited and can change according to what the some other clients on the same web server use. With a virtual or a dedicated web server, on the other hand, you'll have a set amount of RAM that will not be used by anybody else even if you don't use it at a certain time.