Rainbows are optical phenomena that occur when sunlight interacts with water droplets in the atmosphere, causing a spectrum of colors. They form an arc with red on the outer part and violet on the inner part. Rainbows can be caused by rain, mist, spray or dew. Many cultures have myths and legends about rainbows, and some Christian and Jewish traditions view the rainbow as a symbol of God's promise not to flood the world again.

1. Rainbows Where Do They Come From?