Semen is a fluid produced by the male reproductive system that contains sperm cells, which are essential for reproduction. It is composed of sperm, which are the male reproductive cells, and various fluids from glands such as the prostate gland and seminal vesicles. These fluids provide nourishment and a medium for sperm to travel. During ejaculation, semen is released from the body through the urethra. The primary function of semen is to deliver sperm to the female reproductive system, where fertilization of an egg can occur, leading to the potential development of a new organism.