Sunblock, sometimes referred to as sunscreen, is a topical gel, spray, or lotion that blocks the sun's ultraviolet (UV) radiation from penetrating the skin by reflecting or absorbing them. It aids in preventing sunburn, early aging, and skin cancer.Prevent UVA and UVB radiationPrevent dark spots, freckles, and hyperpigmentation; soothe and calm irritated skin; hydrate and moisturize the skin; offer broad-spectrum protection; and provide perspiration and water resistance.In order to keep skin healthy and protected, sunscreen must be used every day, especially when engaging in outdoor activities. To reap the benefits of sun protection, use a sunscreen with an SPF of at least 30 and apply it frequently.