Rainbows are one of nature’s most colorful displays. They appear in the sky when sunlight passes through raindrops, creating a dazzling arc of colors. The sunlight bends, or refracts, as it enters each droplet, and this bending separates the light into different colors. Each color travels at a slightly different angle, which is why we see bands of red, orange, yellow, green, blue, indigo, and vi..