A rainbow typically has seven colors: red, orange, yellow, green, blue, indigo, and violet. This traditional division into seven distinct colors was popularized by Isaac Newton and is often remembered by the mnemonic "ROYGBIV." However, in reality, a rainbow is a continuous spectrum of colors with many more hues blending into each other, and the exact number of visible colors can vary depending on conditions and perception. The seven-color model is a simplified way to represent this spectrum.
