The term socket joint refers to a type of articulation where a bone with a rounded head fits into a cup-shaped socket. Synonyms for this type of joint include ball-and-socket joint, enarthrosis joint, spheroid joint, and cotyloid joint. Ball-and-socket joint is the most commonly used term, while enarthrosis joint stems from the Greek word for ball and holder. Spheroid joint refers to the rounded shape of the bone, and cotyloid joint specifically refers to the type of socket found in the hip joint. Regardless of the terminology used, socket joints create a wide range of motion and stability in the body.