Ans: Estrogen is a sex hormone that is produced by the ovaries that are situated in the female reproductive system. There is another sex hormone that is secreted by the ovaries and it is known as progesterone. However, the benefits and functions of estrogen in female bodies tend to be a lot higher than progesterone. This sex hormone helps in providing the physical female characteristics in human beings. It also helps in the facilitation of the menstrual cycle and aids in the birthing cycle as well. Estrogen has other functions such as increasing bone density and keeping the levels of cholesterol in check. Women also use estrogen tablets to increase the levels of estrogen in their bodies.