The DAC on a graphics card is commonly known as a RAMDAC because it takes the data it converts directly from the card's memory. RAMDAC speed greatly affects the image you see on the monitor. This is because the refresh rate of the image depends on how quickly the analog information gets to the monitor.
A circuit that accepts digital input signals and converts them to analog output signals. Sometimes called DAC chips, they are used in VGA video cards, for example.
A device that converts digital signals to analog signals. CD players, laserdisc players, DBS boxes,and DVD players all contain digital-to-analog converters.