The Proximal Interphalangeal Joint (PIP joint) is a hinge joint located in the fingers and toes. It connects the first and second phalanges, allowing for bending and straightening movements. Each hand has four PIP joints, while each foot has five, facilitating essential functions like gripping and walking. The PIP joint is surrounded by ligaments and a joint capsule, providing stability and support. It plays a crucial role in hand dexterity and foot mobility. Injuries or conditions affecting the PIP joint, such as arthritis or dislocations, can significantly impact daily activities and overall quality of life.