Sunburn occurs when the skin is exposed to ultraviolet (UV) rays from the sun for a prolonged period without adequate protection. However, individual susceptibility to sunburn varies due to several factors, including genetics, skin type, and melanin levels. Melanin is the pigment responsible for skin color, and higher melanin levels provide better natural protection against UV radiation. People with darker skin tones have more melanin, reducing the risk of burning, while those with lighter skin tones are more prone to sunburn. This genetic difference explains why one person might not burn despite sun exposure, while another burns easily. Another important factor is the Fitzpatrick skin type classification, which categorizes skin from Type I (very fair, always burns) to Type VI (dark brown or black, never burns). This classification helps predict sun sensitivity and guides appropriate sun protection measures. Additionally, factors like the duration of sun exposure, geographical location, time of day, and use of sunscreen significantly influence sunburn risk. Individuals with lighter skin or less melanin should use high-SPF sunscreen, wear protective clothing, and avoid peak sun hours to minimize burning. Understanding these factors improves personal sun safety and helps explain situations such as why one person does not burn while another burns, even during shared sun exposure. This knowledge supports better skincare choices and highlights the importance of personalized sun protection strategies.