Which is the largest joint in the human body?

Joints are the points at which two or more bones connect and allow movement.

A synovial joint is a connection between two bones that consists of a fluid-filled cavity lined with cartilage. 

The largest synovial joint in the human body is the knee joint. 

The large femur bone of the thigh connects to both the tibia and fibula of the leg to form the knee joint. The patella covers the knee joint and is called the knee cap. As a result, 'the knee joint' is the most complex and largest joint in the human body.