Selecting A/D converters in microprocessor design

What is a DAC?
Digital-to-analogue converter; a device that converts digital pulses to analogue signals (current, voltage or electric charge).

What is an ADC?
ADC stands for analogue-to-digital converter. It is an electronic device that converts input analog voltage to a discrete digital number.
Applications include anything that involves the processing of analogue signals into digital form.

What is an embedded system?
An embedded system refers to any electronic system that uses a CPU chip, but that is not a general-purpose workstation, desktop or laptop computer. Embedded systems generally use microprocessors, or sometimes custom-designed chips or both. It is used in various applications such as vehicles, machine tools and consumer electronics.