RAM, which stands for Random Access Memory, is a computer storage media which could be accessed noticeably faster than a hard disk drive, simply because the information can be read randomly, skipping the bytes before the needed data is reached. On a web server, the RAM is employed to load scripts and web apps once they are executed, so the more RAM you may use, the more applications you will be able to run concurrently and the more people shall be able to look through your websites without any effect on the site’s/server’s functionality. Unlike a disk drive, however, the RAM is used for momentary storage purposes, because the data is lost when the power is shut off. When you use a shared web hosting account, the physical memory that your scripts are able to use may be limited and might change based on what the some other clients on the same machine use. Through a virtual or a dedicated web server, alternatively, you will have a guaranteed amount of RAM which will not be used by others even when you don't use it at a certain time.