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Nutrients play a crucial role in the human body right from growth and development to day-to-day functions. In nutrients, one such essential and a micronutrient is a Vitamin. There are 13 types of vitamins in humans of which, 9 are water-soluble and 4 are fat-soluble. The fat-soluble vitamins are A, D, E & K. Group of B and C vitamins are water-soluble.The fat-soluble Vitamin D is commonly known as Sunshine Vitamin. Vitamin D is of two types D2 and D3. It has a significant contribution to the absorption of calcium, phosphate, and magnesium from the intestines. Calcium and phosphate are the two important minerals in the development of a bone. Vitamin D helps in regulating the level of these two minerals. Thus, it helps keep bones strong and healthy by regulating bone mineral density. Adequate levels of Vitamin D are necessary to prevent bone softening, pain, fractures, increased fragility, and muscle weakness in adults. In children, it aids in preventing rickets which is characterized by compromised growth, soft and weak bones of the long extremities. The importance of vitamin D in the body is beyond bone health as well. Vitamin D helps reduce the risk of certain cancers (colon, pancreas, breast, prostate) respiratory infections, and also augment immunity against viral and bacterial infection. Vitamin D also possesses anti-inflammatory action. The conditions where adequate levels of Vitamin D are significant are diabetes, asthma, depression, hyperactive kids, Alzheimer’s, schizophrenia, obesity, pregnancy, and dementia. Precisely, from infant to old, this Vitamin D is needed for the normal functioning of cells, immunity, bone health, prevention of certain diseases, muscle function, normal anti-inflammatory responses, and lower chances of fractures. Thus, Vitamin D is the backbone of one’s health.