While speaking, we express our emotions, and we can show attitude. These things are essential to keep the audience connected to you. If you use a monotone voice, it may bore who is listening to you. When choosing the right words to say, we also need to know the best way to enounce them because improper use can generate a misintended message. So, be clear and pay attention to the intonation. This way, you will avoid misunderstandings and will get attention from the audience.
Alex Lyon, a communication coach, speaks about it in the video below if you want to learn more about vocal tone. And you can check from 0:15 to 0:53 his meaning of vocal tone:
Photo by Jason Rosewell on Unsplash https://unsplash.com/photos/ASKeuOZqhYU