What does rainbows come out?

Rainbows appear when sunlight refracts, reflects, and disperses through water droplets in the atmosphere. This process creates a spectrum of colors that forms a circular arc in the sky, typically seen when the sun is low and rain is present. The light is bent at different angles for different colors, resulting in the vibrant bands we see. Rainbows are most commonly visible when the sun shines after a rain shower.