<human>:  Explain the phenomenon of rainbows in the sky.
<bot>: Rainbows are one of nature's most spectacular sights. They are created when sunlight passes through water droplets in the atmosphere. The water droplets act as a prism, refracting the light into the seven spectral colors of the rainbow – red, orange, yellow, green, blue, indigo, and violet. Depending on the time of day and the water droplets' size, rainbows may appear single or double, and they can even appear as a full circle sometimes. Rainbows are a beautiful reminder of our world's beauty and nature's magic.