Reproductive biology is the field of biology, which delves into both sexual and asexual reproduction. It includes several other fields like, sexual development, sexual maturity, endocrinology, fertility and reproduction. Endocrinology is an area of reproductive biology, which deals with the endocrine system, and the diseases related to it. It is a system of glands, which is responsible for the secretion of hormones. They are the major drivers of human reproduction. They are responsible for controlling the menstrual cycle and for sexual reproduction. The main reproductive hormones are testosterone and estrogen. While testosterone stimulates sperm production in men, estrogen causes eggs to mature in the ovaries after a girl reaches puberty. The topics included in this book on reproductive biology and endocrinology are of utmost significance and bound to provide incredible insights to readers. It traces the progress of these fields and highlights some of their key concepts and applications. Those in search of information to further their knowledge will be greatly assisted by this book.