TENS, or Transcutaneous Electrical Nerve Stimulation, is a therapy that uses low-voltage electrical currents to relieve pain. It involves placing electrodes on the skin near the area of discomfort, which deliver electrical impulses that can help block pain signals from reaching the brain. This method is often used for conditions like arthritis, back pain, and muscle injuries. The device used for TENS therapy is portable and typically battery-operated, making it convenient for home use. Sessions can last from 20 to 60 minutes, and the intensity of the electrical impulses can be adjusted based on individual comfort levels.