Final answer:
In digital audio, quantization refers to the number and relative intensity of multiple frequencies in the sound wave. It involves discretizing the continuous variation in intensity values into specific levels or steps, allowing the sound to be represented using binary digits.
Step-by-step explanation:
In digital audio, quantization refers to the number and relative intensity of multiple frequencies in the sound wave. When analog sound is converted into digital signals for recording or processing, the continuous variation in intensity values is discretized into specific levels or steps. This allows the sound to be represented using binary digits, such as 16-bit or 24-bit quantization, which determines the resolution and fidelity of the digital audio.