Edging in concrete finishing helps to:

Edging in concrete finishing is primarily utilized to create a neat and rounded edge along the perimeter of the slab. This process serves not only an aesthetic purpose, contributing to a more visually pleasing appearance, but also has practical benefits. A rounded edge helps to protect the slab from chipping and cracking, making it more durable over time.

Additionally, rounded edges can reduce the potential for injury, especially in environments where people are in close proximity to the concrete surfaces. By providing a smooth transition at the edges rather than a sharp corner, the likelihood of accidents decreases.

In contrast, while other options might touch upon different aspects of concrete finishing, they do not accurately reflect the primary role of edging. For example, filling voids or enhancing slip resistance pertains to different finishing techniques or treatments rather than the specific action of edging. Therefore, the focus on creating a neat rounded edge encapsulates the essential function of edging in concrete finishing.