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What’s the difference between voice and tone? Think of it this way: You have the same voice all the time, but your tone changes. You might use one tone when you’re out to dinner with your closest friends, and a different tone when you’re in a meeting with your boss.
Your tone also changes depending on the emotional state of the person you’re addressing. You wouldn’t want to use the same tone of voice with someone who’s scared or upset as you would with someone who’s laughing.