Cupping therapy uses suction cups placed on the skin to create a vacuum, drawing blood and fluids to the area, which aims to relieve pain, reduce inflammation, improve circulation, relax muscles, and promote healing by boosting blood flow and oxygen to tissues. It's an ancient practice used for various conditions like back pain, headaches, muscle tension, digestive issues, and stress relief, acting as a deep tissue massage that can leave circular bruises on the skin.