"Roy G. Biv" is an acronym used to help remember the sequence of colors in a rainbow. Each letter stands for a color: R for Red, O for Orange, Y for Yellow, G for Green, B for Blue, I for Indigo, and V for Violet. This mnemonic is particularly useful in art and science education to teach about light and color. The colors represented by "Roy G. Biv" correspond to the visible spectrum of light, which is produced when sunlight is refracted through water droplets, creating a rainbow. Understanding this acronym can enhance one's appreciation of natural phenomena and the science of optics.