Animals use sound to communicate and find things. Dolphins use echolocation to hear each other they make a noise like a click, the click creates sound waves, and they wait to see which direction the echo came from to locate an object or another dolphin.
People could use information to treat hearing loss, an ear surgery is called stapedectomy and it treats hearing loss. The surgery is done to to replace the stirrup bone with an artificial part. The surgery can restore normal hearing in more than 90% of most cases.
Some people use auditory learning. Auditory learning is when someone learns through sound. An auditory learner depends on listening and speaking as a main way of learning.