The vitamin produced when the human body is exposed to sunlight is Vitamin D, often referred to as the "sunshine vitamin." When ultraviolet B (UVB) rays from sunlight hit the skin, they trigger a chemical reaction that converts 7-dehydrocholesterol, a compound in the skin, into vitamin D3 (cholecalciferol). Vitamin D is crucial for maintaining healthy bones, aiding calcium absorption, and supporting the immune system. While sunlight is an effective source for vitamin D synthesis, it can also be obtained through dietary sources such as fish, eggs, and fortified foods. However, excessive sun exposure can lead to skin damage, highlighting the need for balanced sun safety practices.