Final answer:
Joints, also known as articulations, are places where bones or bone and cartilage come together. They can be classified structurally as fibrous, cartilaginous, or synovial joints, and functionally as immobile, slightly moveable, or freely moveable joints.
Step-by-step explanation:
A joint, also called an articulation, is any place where adjacent bones or bone and cartilage come together to form a connection. Joints are classified both structurally and functionally. Structurally, joints can be classified as fibrous, cartilaginous, or synovial joints. Functionally, joints can be classified as immobile, slightly moveable, or freely moveable joints.