In golf, the term arc or swing arc refers to the path that the clubhead follows during the golf swing. It represents the curved trajectory that the clubhead travels from the backswing through impact and into the follow-through.

Here are some key points about the arc in golf:

1. Curved Path: The golf swing is not a straight-line motion but rather a rotational movement that creates an arc. The arc is characterized by a circular or elliptical path as the golfer swings the club around their body.
2. Width and Shape: The width and shape of the swing arc can vary among golfers due to individual swing styles, body types, and swing plane preferences. Some players may have wider and more rounded arcs, while others may have narrower and more compact arcs.
3. Backswing Arc: The backswing arc is the portion of the swing where the clubhead moves away from the ball, reaching its farthest point from the target. This arc is crucial in setting the club in the proper position and establishing the desired swing plane.
4. Downswing Arc: The downswing arc is the segment of the swing where the clubhead starts moving back towards the ball and eventually makes contact with it. It is during this phase that the golfer generates power, speed, and proper clubface alignment to strike the ball effectively.
5. Follow-Through Arc: The follow-through arc is the continuation of the swing after impact, where the clubhead moves toward the target. It allows the golfer to maintain balance, complete the swing motion, and control the direction and trajectory of the shot.
6. Swing Plane: The swing plane refers to the angle at which the clubhead moves during the swing. It is often associated with the arc of the swing, as the clubhead should ideally follow a consistent plane throughout the swing for consistency and accuracy.

Understanding and maintaining a proper swing arc is crucial for achieving consistent ball-striking and maximizing distance and accuracy in golf. It requires a combination of technique, body rotation, and timing to establish an effective swing path that suits the golfer's individual style and goals.