A moonbow, also known as a lunar rainbow or white rainbow, is a rainbow created by moonlight rather than sunlight. It's formed when light from the moon refracts and reflects off water droplets, like those in rain or mist, creating a visible arc of light in the sky. Moonbows are generally fainter and less colorful than regular rainbows, and they are much rarer due to the need for specific conditions like a full or near-full moon, clear skies, and dark skies.