What is the difference between tuning to A432 and A440, and how does it affect the sound of music?

The difference between tuning to A432 and A440 is the frequency at which the A note is set. A432 is slightly lower in pitch than A440. Tuning to A432 can create a warmer and more relaxed sound in music, while A440 tuning is more commonly used and can sound brighter and more energetic.