Electromyography (EMG) is a technique used to measure and record the electrical activity of muscles. It involves placing electrodes on the skin surface or inserting them into the muscle to detect the electrical signals produced by muscle contractions. EMG is commonly used in research to study muscle function, muscle disorders, and movement patterns. It can provide valuable information on muscle activation, coordination, and timing, making it a valuable tool in biomechanics, physical therapy, and sports science research.