It depends on the ingredients (materials used to make something). Some sunscreens work by blocking the Sun’s rays. The ingredients reflect (to bounce off of a surface) the Sun’s rays. It’s like when a ball bounces off a wall.
Some sunscreens work by absorbing (to take in) the Sun’s rays. It’s like when a sponge soaks up water. The Sun’s rays do not reach your skin.
Photo Credit: Science Source
