In string playing the rapid movement of the wrist and finger creates a throbbing effect called?

In string playing, the rapid movement of the wrist and fingers that creates a throbbing effect is known as "tremolo." This technique involves quick, repeated strokes on the string, producing a shimmering, sustained sound that can enhance the emotional intensity of the music. Tremolo is often used in both classical and contemporary compositions to add texture and depth to the performance.