Waves have many benefits. Waves in the ocean are constantly moving, allowing generators to create clean energy. Sound waves allow us to feel and hear the wonderful world around us. When you tune your radio, watch TV, send a text message, or pop popcorn in a microwave oven, you are using electromagnetic energy. You depend on this energy every hour of every day. Without it, the world you know could not exist. Electromagnetic waves do not need molecules to travel. This means that electromagnetic waves can travel through air, solid objects and even space.