The testicle is a male reproductive organ responsible for producing sperm and hormones, particularly testosterone. Typically, males have two testicles, which are located in the scrotum, a pouch of skin that hangs outside the body. This external positioning helps regulate temperature, which is crucial for sperm production. Testicles are composed of seminiferous tubules, where sperm cells are generated, and interstitial cells, which produce hormones. Proper functioning of the testicles is essential for male fertility and overall health. Issues such as testicular cancer or varicocele can affect their performance and require medical attention.