Estrogens are a group of hormones primarily responsible for the development and regulation of the female reproductive system and secondary sexual characteristics. They play a crucial role in processes such as the menstrual cycle, pregnancy, and bone health. The main types of estrogens include estradiol, estrone, and estriol, each with specific functions in the body. In addition to their role in female health, estrogens are also present in males, albeit in lower levels, where they contribute to various bodily functions. Imbalances in estrogen levels can lead to health issues, including menstrual disorders, osteoporosis, and certain types of cancer.