Biofeedback devices are tools that help individuals gain awareness and control over physiological functions, such as heart rate, muscle tension, and skin temperature. By providing real-time data about these bodily processes, users can learn to manage stress, anxiety, and other health conditions more effectively. These devices often use sensors to monitor bodily functions and display the information on a screen. Common types of biofeedback devices include electromyography (EMG) for muscle activity, heart rate variability (HRV) monitors, and temperature sensors. They are used in various settings, including clinics, sports training, and personal wellness programs.