Which joint type is described as freely movable and most common in the body?

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Mobility of joints is categorized by how much they move: immovable, slightly movable, and freely movable. The freely movable group, diarthroses, are synovial joints with a joint cavity, synovial fluid, a lubricating capsule, ligaments, and articular cartilage that together enable a wide range of motion. This design makes them the most common joint type in the body, found in the knees, elbows, shoulders, hips, and many other joints. Structural categories like fibrous joints describe joints held together by fibrous tissue and are typically immovable, which is why they don’t fit the description of freely movable. So, the description best matches diarthrosis.