The elbow is what type of joint?

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A synovial joint is a joint that is freely mobile. There are six types of synovial joints:
Hinge: In hinge joints, the slightly rounded end of one bone fits into the slightly hollow end of the other bone. One bone moves while the other remains stationary, like the hinge of a door. Your elbows and knees are hinge joints.
Planar: Planar joints are bones with articulating (moving against each other) surfaces that are flat or slightly curved faces. The tarsal bones in your foot and the carpal bones in your wrist are examples of a planar joint.
Pivot: Pivot joints consist of the rounded end of one bone fitting into a ring formed by the other bone. This allows for rotational movement. An example of a pivot joint is the joint of the first and second vertebrae of the neck that allows the head to move side to side.
Condyloid joints: These joints consist of an oval-shaped end of one bone fitting into a similarly oval-shaped hollow end of another bone. These joints allow biaxial movements-i.e., forward and backward, or from side to side, but not rotation.
Saddle joints: Saddle joints are so named because the ends of each bone look like a saddle, with concave and convex portions that fit together. Saddle joints allow angular movements similar to condyloid joints but with a greater range of motion. An example of a saddle joint is the thumb joint, which can move back and forth and up and down but more freely than the wrist or fingers.
Ball-and-socket joints: These joints possess a rounded, ball-like end of one bone fitting into a cup-like socket of another bone. This type of joint has the greatest range of motion with all movement types possible in all directions. An example of a ball-and-socket joint is your shoulder.
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The Elbow Is What Type of Joint