What type of product is used for setting hair styling?

The choice of hair spray as the correct product for setting hair styling is based on its specific purpose and formulation. Hair spray is designed to provide hold and support to styled hair, helping to maintain the desired shape and texture throughout the day. It typically contains polymers that create a firm or flexible bond around the hair strands, allowing styles to withstand humidity, wind, and movement.

In contrast, hair serum is primarily used for smoothing and adding shine to hair, making it more manageable but not specifically for setting styles. Leave-in conditioner serves to add moisture and detangle hair without the intention of providing hold. Shampoo is a cleansing product used to remove dirt, oil, and product buildup from hair, and it does not contribute to styling or holding the shape of hair. Thus, hair spray stands out as the most suitable choice for achieving lasting hairstyles.