Rainbows are often seen when the sun comes out after or during a rainstorm.Rainbows are caused when sunlight shines through drops of water in the sky at specific angles.When white sunlight enters a raindrop,it exits the raindrop a different color.When light exits lots of different raindrops at different angles,it produces the red,orange,yellow,green,blue,indigo,and violet that you see in a rainbow.Together,these colors are know as the spectrum.These colors can sometimes be seen in waterfall and fountains as well.