Sunscreens help to filter out UV radiation using a combination of two main types of active ingredients. Titanium dioxide or zinc oxide which form a physical barrier (physical sunscre
ens) that sit on the skin's service. Those active ingredients reflect and scatter UV waves. Chemical sunscreens meanwhile absorb UV rays and release their energy as heat. Sunscreens come in many forms based on skin type and preference, ie. Gel, lotion, spray, foam or mineral.
Everyone needs sunscreen. Yes, even people of African or Hispanic decent and babies. It's a non negotiable. Anyone who's prone to sun exposure or UV radiation should be protected and that's everyone who steps outside of their home or sits by windows. Sunscreens not only block cancer causing rays but also aid in the prevention of hyperpigmentation and skin aging.
Sunscreens are measured by SPF (Sun Protection Factor), the fraction of sunburn-producing UV rays that penetrate the skin. That's the number that you see on the packages typically; Spf 15, Spf 50, etc. The higher the number the more protection and less frequently you'd need to apply your sunscreen during sun exposure. You will always look for a broad-spectrum sunscreen that will protect against UVB and UVA rays. Remember, sunscreen will always be your last step in your skincare routine after moisturizer.