There are two types of sunscreens: chemical and physical. Both create a shield on top of your skin from the harmful effects of the sun’s UV rays but they act in different ways, depending on the mechanism.
The chemical sunscreen absorbs the rays before they damage the skin, allowing the UV light to penetrate. After the UV light is absorbed by the skin, the chemicals in the sun protection start to work by converting it into heat.
Unlike chemical sunscreens, physical sunscreens are composed mainly of zinc oxide and titanium dioxide, which change into a physical shield blocking UV rays and reflecting radiation. So... should we use a chemical or physical sunscreen? It depends on your skin type, as both have advantages and disadvantages.