Leather grip, in the context of sports equipment like tennis racquets, is a type of handle wrapping made of leather, primarily used to enhance feel and provide better bevel definition.
Based on the provided YouTube video transcript snippet, a primary benefit of using a leather grip is to feel the bevels on the handle. Bevels are the angled edges of the racquet handle, and feeling them allows for a more precise grip and greater control over the racquet's orientation during play. The video also mentions the impact of the grip on the balance of the racquet, potentially making it more "headlight" (less weight towards the head).
In summary, leather grips are chosen for their feel and the enhanced ability to sense the bevels of the racquet handle, leading to increased control.