What is the main function of a primer in makeup application?

The main function of a primer in makeup application is to create a smooth base and enhance the longevity of the makeup. Primers are specifically formulated to fill in imperfections such as fine lines and uneven textures, allowing makeup to glide on more easily and adhere better to the skin. This helps create a flawless appearance while also extending the wear of makeup throughout the day. When applied correctly, a good primer can significantly improve the overall look and durability of foundation and other makeup products.

While there are products that provide a glossy finish, add color, or hydrate the skin, these are not the primary purposes of a primer. Priming is primarily about preparation for the makeup application process, ensuring that the makeup lays down beautifully and lasts longer, which is why this option is the most accurate choice.