RAM, which stands for Random Access Memory, is a computer storage media which is accessed faster than a hard drive, because the data can be read randomly, skipping the bytes before the needed data is reached. On a server, the RAM is used to load scripts and web applications when they are executed, so the more RAM you are able to use, the more programs you will be able to run all at once and the more people will be able to browse your websites without any effect on the site’s/server’s functionality. Unlike a disk drive, however, the RAM is used for non permanent storage purposes, due to the fact that the information is lost as soon as the power is shut off. In case you use a shared web hosting account, the physical memory your scripts can use may be limited and may change based on what the some other clients on the same web server use. Using a virtual or a dedicated web server, however, you will have a fixed amount of RAM that won't be used by others even when you don't use it at a certain time.