The Tyndall Effect is a phenomenon where light is scattered by small particles in a colloid or in very fine suspensions. This scattering causes a beam of light to become visible when it passes through a mixture, such as when sunlight shines through dust in the air or when a flashlight is directed into a foggy environment. This effect is named after the scientist John Tyndall, who studied the scattering of light in the 19th century. The Tyndall Effect helps distinguish between solutions and colloids; solutions do not scatter light, while colloids do, making the effect useful in various scientific applications.