Sunblock/ˈsʌnblɑːk/ Definition 1 of 1Pro Tip 1/3Protection Importance Sunblock is crucial for skin safety in the sun to prevent burns and long-term damage. Even on a cloudy day, wearing sunblock can protect your skin. Pro Tip 2/3Outdoor Activities Sunblock is often mentioned when discussing outdoor or beach activities. Pack your sunglasses and sunblock for our hiking trip. Pro Tip 3/3Health Advisories Health experts frequently recommend sunblock to reduce skin cancer risks. Health campaigns remind citizens to use sunblock for cancer prevention.