What is the difference between sunblock and sunscreen?

The main difference between sunblock and sunscreen lies in their active ingredients and how they protect the skin from UV rays. Sunblock contains physical blockers like zinc oxide or titanium dioxide that sit on the skin's surface and reflect UV rays, providing immediate protection. In contrast, sunscreen typically contains chemical filters that absorb UV radiation and convert it into heat, which is then released from the skin. Both types are effective, but sunblock often offers broader-spectrum protection and is less likely to irritate sensitive skin.