ELI5: Explain Like I'm 5

sunscreen

Sunscreen is a lotion or spray that you put on your skin when you go outside in the sun. It helps keep you from getting burned by the sun's rays, which can be harmful. Sunscreen has special ingredients that help to block the sun's rays, so they don't hurt your skin as much. Sunscreen works by reflecting the sun's rays off your skin, so they are not as powerful when they hit you. It's important to use sunscreen when you are outside so you don't get a sunburn.