- A microphone is a transducer, a device that converts one form of energy into another. - Its function is to capture sound (which consists of variations in air pressure) and transform it into a corresponding electrical voltage or current signal. - Different types of microphones use different principles (e.g., electromagnetic induction in dynamic microphones, capacitance change in condenser microphones) to achieve this conversion. - The electrical signal produced by a microphone can then be amplified, recorded, or transmitted.