The dynamo effect refers to the process by which a rotating, convecting, and electrically conducting fluid (such as molten iron in Earth’s outer core) generates a magnetic field through a self-sustaining mechanism. This effect occurs in celestial bodies like planets, stars, or moons that have fluid layers capable of conducting electricity and undergoing convective motion. In the context of celestial bodies like Earth, the dynamo effect is a significant factor in generating their magnetic fields. In Earth’s case, the convective motion of molten iron in the outer core coupled with the planet’s rotation creates a self-generating magnetic field. This field protects Earth’s surface from harmful solar radiation, contributes to the functioning of the magnetosphere, and influences phenomena like the auroras.