The prostate is a sexual gland located between a man's bladder and penis. It is located in the pelvis behind the pubic bone (bone you can feel just above the penis) and in front of the rectum.
Check out the figure below:
|Source: Wikimedia Commons and NCI|
This shows a cutaway side view or "sagittal" view of the male pelvic area. The prostate is located in the boxed area.
This is a closer view of the prostate and the seminal vesicles which store the semen created by the prostate.
The main purpose of the prostate is to create semen. Semen is the vehicle for sperm transport to the female reproductive system. The semen is also critical in helping the sperm become active within the female reproductive tract, a process called capacitation.
So hopefully this post has shed some light on what it is and where it is. I'll do another post next on how the prostate is examined.