Humans and other animals use sound energy to communicate. When you speak, you create sound waves that travel through the air. When the sound wave reaches the ears of someone nearby, their brain is able to translate the sound waves into words.
What is energy?
Energy is the ability to do work. There are many different kinds of energy, such as light, sound, and heat.
We need energy for our homes to power lights, refrigerators, air conditioners, and computers. We use energy when we drive cars or pedal a bike. We power our devices with energy stored in batteries. Even sleeping requires energy!