What is "prostate"?

The prostate is a walnut-sized gland located in the male reproductive system, situated just below the bladder and in front of the rectum. Its primary function is to produce and secrete prostate fluid, a component of semen that nourishes and protects sperm cells during ejaculation. The prostate is also involved in the control of urine flow by surrounding the urethra, the tube that carries both urine and semen out of the body.