After a storm, look at the sky. You might see a rainbow. This beautiful arc of color forms when sunlight shines through water in the air. Usually, light from the sun looks white. But it’s really all the colors of the rainbow.
When sunshine passes through water droplets, they break up the white light. This is what we see when we look at a rainbow. Every rainbow has seven colors: red, orange, yellow, green, blue, indigo, and violet. The colors always appear in this order.