A loop in table tennis is a type of stroke characterized by a significant amount of topspin. When the ball bounces on the opponent’s side of the table, it accelerates downward faster than any other type of stroke. To execute a loop, swing your arm and maximize the tangential contact between the ball and the surface of the rubber with a brushing stroke.
Brush
Brush in table tennis is a general term of hitting the ball on its surface in a tangential (horizontal) direction with the primary goal of generating spin. Loop is a type of stroke that “brushes” the ball.