Bandages are used to support injured body parts, immobilize areas like dislocated joints, apply pressure to stop bleeding, and secure dressings in place. The key principles for applying bandages are to start from the inner aspect moving outward, overlap turns by 2/3, and end the bandage on the outer side of the body. Common bandage types include triangular, gauze, adhesive, and different wrapping methods like circular, spiral, and figure-of-eight are used depending on the body part. Special considerations are needed for injuries around joints, the head, eyes, ears, fingers and other areas.