Biofeedback is a mind-body technique where electrical pads are used to monitor bodily functions like heart rate and breathing patterns, allowing patients to learn to control these functions. It works by helping patients become aware of bodily sensations and teaches self-regulation skills to promote health and well-being. Biofeedback has been used since the 1970s to treat various conditions like anxiety, headaches, pain, and neurological issues by monitoring shifts in physiology and training patients to adapt their mental and emotional responses.