What kind of hair color is used to enhance and add shine?

The correct choice emphasizes the use of a glaze in hair coloring. A glaze is designed to not only enhance the natural color of the hair but also to add shine and a silky finish. Unlike dyes or permanent colors, which may alter the hair's color significantly, glazes typically work by depositing sheer color and using conditioning agents that give the hair a glossy appearance without committing to a permanent change. This makes glazes an ideal option for individuals looking to freshen up their color and boost shine without the long-term implications of more permanent coloring options.

In contrast, dye tends to provide a more drastic change, while highlights involve lightening specific strands, somewhat changing the overall look as opposed to simply enhancing what is already present. Permanent color offers a long-lasting effect but typically does not focus solely on adding shine; its primary purpose is to change the hair color significantly. Overall, the function of a glaze is specifically aligned with enhancement and shine, making it the most appropriate answer.