Rainbows are one of the most beautiful natural phenomena there is. Most of us are familiar with how rainbows form—we know to look for them after a rain when the sun peeks through the clouds. But what most people don't know is that there is more than one kind of rainbow.

There are 12 different kinds of single arc rainbows that are decided based on the colors, strength of the bands, and supernumerary bows that appear, or don't appear, in the arc.

One of the rarest forms is multiple, or double, rainbows. They occur when several rainbows form in the same place at the same time. It takes at least one primary rainbow to generate this sight, as well as several other secondary rainbows. There is always space in between each one.

3 primary colors: red, yellow, and blue. 3 secondary colors: orange, green, and violet. 6 tertiary colors: red-orange, yellow-orange, yellow-green, blue-green, blue-violet, and red-violet.