DAC is an acronym for Digital to Analog Converter. It accepts a signal in the digital domain (like that from a PC playing digital files, CD player's digital output, music server, etc.) and converts it into an analog signal which can then be fed into a preamp or integrated amp of a stereo system. There are many methods of doing the actual digital to analog conversion... most use an IC chip DAC but there are also DACs built of discrete components. Playback devices for digital files commonly used to drive headphones (like what appears to be a DAP in your avatar) contain an internal DAC and amplifier circuitry to provide an amplified analog output for connected headphones.This maybe a dumb question but what exactly is a dac used for?
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