Define Tyndall effect?

The earth’s atmosphere is a mixture of smoke particles, tiny water droplets and air particles. When light falls on such colloidal particles, it is scattered (or deflected) thereby making the path of light beam visible. This phenomenon is called Tyndall effect. The light rays reach us after the deflection (scattering) from all these particles. Tyndall effect is also seen due to scattering of light through tiny droplets in mist or when sunlight enters a canopy of dark forest(GIVEN IN PICTURE)