Which hair color technique involves highlighting specific sections?

The technique that involves highlighting specific sections of hair is foiling. This method entails applying a lightening agent or color to sections of hair that are then wrapped in foil. The use of foil serves a dual purpose: it helps to isolate the highlighted strands from the rest of the hair, ensuring a precise application and preventing the color from bleeding onto adjacent strands. This results in a more controlled and vibrant highlight, allowing for a significant contrast between the natural base color and the highlighted sections.

In contrast, glazing is more focused on enhancing the overall shine or tone of the hair rather than adding specific highlights. Balayage, while also a highlighting technique, is characterized by its freehand application, where color is painted on the hair rather than applied in specific sections or wrapped in foils. Ombre involves a gradient effect, transitioning from one color to another, usually darker to lighter, without the precision of foiling or specifically isolating sections. Thus, foiling is the correct choice for highlighting specific sections of hair.