A computer industry acronym for "random access memory", which is just a fancy way of saying that the memory in question can be read or written at will. (As opposed to ROM, which can usually only be written to once.) Ordinary RAM is used in synths for performer-editable patch memory, as well as operating system uses, and RAM usually accounts for nearly all of the memory available in modern personal computers. Most types of RAM have the disadvantage that they are volatile; that is, they become erased if power is removed. Flash memory is a type of RAM that retains its contents without power.