Welcome, Young Explorer!

Right now, as you read these words, you are surrounded by invisible waves. They carry your favorite songs to your radio, stream videos to your phone, help airplanes navigate safely through clouds, and even cook your food in the microwave. These magical, invisible travelers are called electromagnetic waves — and by the end of this book, you will understand exactly how they work.

This book is written for anyone who is curious about the world. You do not need to have studied physics before. We will start from the very beginning — what is a wave? — and build our knowledge step by step, all the way to cutting-edge technologies like 5G and satellite navigation.

Along the way, you will find colorful diagrams, fun facts, real-world examples, and thought experiments. Think of this book as a conversation between you and the universe's most amazing invisible force.

Ready? Let us begin!