Prostate cancer is a type of cancer that develops in the prostate gland, which is a small gland in men responsible for producing seminal fluid. This fluid plays a crucial role in nourishing and transporting sperm. Prostate cancer is one of the most common cancers among men, especially in older age groups. It can be slow-growing and remain confined to the gland, causing minimal harm, or it can be more aggressive and spread quickly to other parts of the body.