What cutting technique involves creating a clean line around the hairline?

The technique that involves creating a clean line around the hairline is edging. Edging focuses specifically on establishing precise, defined boundaries at the hairline, which is crucial for achieving a polished and professional look. This technique is often used along the forehead, nape, and around the ears to ensure that the hair appears neatly groomed and well-defined.

Edging is particularly important in styles that require a sharp contrast between different lengths or where a distinct separation between the hair and the skin is desired. This technique emphasizes not only the line's sharpness but also ensures that other elements of the hairstyle, such as layers or texture, are highlighted effectively against the cleared edges.

The other techniques mentioned do not focus directly on the clean definition of the hairline. Shaping generally refers to creating overall form and structure within a hairstyle, while layering involves cutting the hair to varying lengths to create movement and volume. Texturizing is intended to remove bulk and add dimension, which serves a different purpose than defining edges. Each technique plays a specific role in hair cutting, but edging is solely concentrated on the neatness of the hairline itself.