Leg compression therapy uses external pressure from air boots to improve circulation, reduce swelling (edema), and alleviate discomfort by promoting blood and lymphatic fluid flow towards the heart. It is a common treatment for various conditions, including chronic venous insufficiency, deep vein thrombosis, lymphedema, post-surgery recovery, and to aid in the healing of venous ulcers. The therapy is most effective when combined with exercises, and professional guidance is important for proper application and benefit.