RAM is the most common type of computer memory, and it's where the Mac stores system software, programs, and data you are currenly using. The process of a graphics program redisplaying a graphic on the screen after you've made a change to the object. The rate that an image is redrawn on the monitor. The lower the refresh rate the better. The part of a mac file that holds program specific resources such as menus, dialog boxes, sounds, icons, and reformatting instructions.
Applications always have a resource fork.
ROM is permanent memory tht's programmed on a chip and can't be altered. It contains parts of the system software responsible for very basic things, such as starting up and drawing images on the screen.