RAM, or Random Access Memory, is a form of computer data storage, that permits the information to be read randomly without accessing the preceding bytes before that. That makes the RAM substantially faster than other sorts of storage devices such as DVDs or HDDs where all of the information has to be read so as to access specific data. In case you have a shared hosting account, the exact amount of memory that your web programs can use may not be fixed and may often depend on the free memory which is available on the physical machine. When using a standalone web server, however, there's always a minimum amount of physical memory which will be available at all times and will not be assigned to other clients even when it isn't used. That is valid with our virtual and dedicated servers.