Physiotherapy electrical stimulation, or electrotherapy, uses electrical impulses to treat pain, muscle weakness, and other conditions by stimulating nerves and muscles to reduce pain, improve movement, and enhance healing. Common types include TENS (Transcutaneous Electrical Nerve Stimulation) for pain relief and NMES/FES (Neuromuscular Electrical Stimulation/Functional Electrical Stimulation) for muscle activation and strength. Benefits include increased circulation, reduced muscle spasms and swelling, and pain relief through blocking pain signals or releasing endorphins.