Vitamins are essential substances for the normal functioning and development of the body. There are two classes of vitamins namely : 
1 .Fat-soluble vitamins 
Fat-soluble vitamins are absorbed with the other fats from the food you eat. When they’re absorbed in this way, they go with the fats and are stored in your body’s fat tissue and liver. ‌
The important fat-soluble vitamins are vitamin A, C, D, E, and K. 
2 .Water-soluble vitamins
Water-soluble vitamins aren’t long-term like fat-soluble vitamins. They don’t get stored in your body. They enter your bloodstream, and anything your body doesn’t need is eliminated through your urine. ‌
Since water-soluble vitamins don’t last long in your body, they need to be replenished frequently.
The important water-soluble vitamins are vitamin C and the collection of B vitamins, including: 
B1 (thiamin)
B2 (riboflavin)
B3 (niacin)
B4 (pantothenic acid)
B6 (pyridoxine)
B7 (biotin)
B9 (folic acid or folate)
B12 (cobalamin)

Website References
https://medlineplus.gov/