Rainbows are a captivating meteorological phenomenon resulting from the interaction of sunlight and water droplets. Specifically, they form when sunlight enters a water droplet, bends (refracts) as it passes through, reflects off the back of the droplet, and then refracts again as it exits. This process separates white light into its constituent colors – red, orange, yellow, green, blue, indigo, and violet – creating the spectrum we observe. The arc shape is due to the specific angle at which light is most intensely refracted and returned to the observer. Variations, such as double rainbows, occur when light reflects twice inside the water droplets. Understanding this scientific explanation demystifies the beauty and wonder of rainbows.