Answer :
Exposure to ultraviolet light darkens the skin by stimulating the synthesis of melanin.
What is melanin?
Melanin is a natural pigment produced by specialized cells called melanocytes, which are found in the skin's basal layer. Its main function is to absorb UV radiation and protect the skin from its harmful effects by darkening it. Melanin production is stimulated by exposure to ultraviolet light, which can cause skin damage over time if precautions aren't taken. The amount and distribution of melanin in an individual's skin determine their skin color.
The more melanin a person has, the darker their skin color will be, and the less melanin they have, the lighter their skin color will be. The body regulates melanin production in response to environmental factors such as sunlight, so skin color can change throughout a person's life based on factors such as sun exposure and genetics.
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