Biofeedback devices use sensors to monitor involuntary bodily functions, such as heart rate, muscle tension, and brain waves, and provide real-time feedback through visual, auditory, or tactile signals to help individuals learn conscious control over these functions. This technique is used to manage stress and anxiety, alleviate chronic pain, treat incontinence, and assist in rehabilitation after injury or stroke. By practicing with the feedback, users can improve self-regulation and apply learned techniques without the device.