Bandages are used for covering wounds, applying pressure to control bleeding, and supporting injuries or medical devices. There are three main types of bandages: roller bandages, tubular bandages, and triangular bandages. Each serves a specific purpose like immobilization or creating slings. There are also several basic bandaging techniques like circular, spiral, and figure-of-eight bandages that are used to securely wrap different parts of the body. Proper bandaging is necessary for wound treatment and injury management.