Final answer:
A diarthrosis is the freely movable type of joint, typically known as a synovial joint, allowing for extensive movement across one or more planes.
Step-by-step explanation:
The freely movable type of joint that most joints in the human body are classified as is called a diarthrosis. These joints, also known as synovial joints, provide the majority of body movements and are found extensively in the appendicular skeleton, which contributes to a wide range of motion in the limbs. Joints in this category are classified into three types based on their axes of motion: uniaxial (movement in one plane), biaxial (movement in two planes), and multiaxial (movement in all three anatomical planes). The diarthrotic type of joint allows for free movement and it is subdivided into multiple categories, each defined by the number of planes it can move through. In comparison to the other joint types, synarthroses are immovable and amphiarthroses allow for slight movement, while diarthroses allow for extensive movement.