Which product is often used to provide shine in hairstyling?

Hair serum is designed specifically to provide shine and enhance the overall appearance of the hair. It usually contains silicones or oils that coat the hair strands, helping to smooth out frizz and reflect light, which results in a glossy finish. This product is particularly useful for adding shine to dry or dull hair and is often applied to the ends of the hair post-styling to achieve a polished look.

In contrast, mousse is primarily used to add volume and body, rather than shine. Hairspray is formulated to hold a hairstyle in place, while gel is used to create structure and define texture without adding luster. Therefore, the right choice for adding shine to hairstyling is hair serum.