RAM: Random Access Memory, the volatile memory used to temporarily store information for processing. This is the fastest type of memory for the computer, and the most expensive. There are several types of RAM.

S-RAM: Static RAM, the most expensive type of RAM found in on-bard memory units, some Printers, and in PCMCIA Type I Cards. D-RAM, Dynamic Ram, Most often seen as the expandable RAM used by the computer for memory.

Raster: A two-dimensional array of black and white cells, called pixels or picture elements, which when displayed on a screen or paper, form an image or representation of an original document.

Rasterization : The process that automatically converts vector and text into raster. This process is done on-the-fly for plotting, or can be stored as a file in raster format.

RGB: Red, Green, Blue; the color language of computers. Computers´ monitors and digital cameras use these colors to create all the colors seen on the monitor and saved in files. Green gives the color green, but is also used for contrast control.

ROM: Read Only Memory, used for primary instructions in many Computer Peripherals and CPU´s Firmware. There instructions can be upgraded from a computer