Analog to Digital converter also called as ADC or A-D Converter or A-to-D converter is a device or a Integrated Component (IC) that converts Analog Signal (normally voltage) into corresponding digital value. This digital value is proportional to the input Analog Signal,
Digital to Analog Converter also called as DAC or D-A Converter or D-to-A Converter is a device that converts digital signal into corresponding Analog Signal. A DAC performs reverse function of ADC. Various aspect of DAC has to be considered while selecting the right one for your application.