The common name for the human body's largest bone is the femur, also known as the thigh bone. This long bone extends from the hip to the knee and plays a critical role in supporting the body's weight during standing, walking, and running. The femur is not only important for movement but also aids in maintaining balance and stability. Its robust structure is necessary to withstand the stresses incurred during activities such as jumping or lifting. Given its size and function, the femur is essential for locomotion and overall mobility in humans.