Why we advised to use an umbrella when we go out in sun?

Using an umbrella when going out in the sun is advised primarily to protect against harmful ultraviolet (UV) rays, which can lead to skin damage, sunburn, and increase the risk of skin cancer. Umbrellas provide shade, helping to regulate body temperature and reduce the risk of heat-related illnesses. Additionally, they can prevent dehydration by minimizing exposure to direct sunlight, making outdoor activities more comfortable and safer.