What is the main benefit of using a primer before applying makeup?

Using a primer before applying makeup primarily serves to create a smooth base for the foundation or other makeup products. This smooth surface allows for better application and blending of makeup, leading to a more polished and professional finish. Primers often contain silicones or similar ingredients that fill in fine lines and imperfections, which enhances the overall texture of the skin and helps products adhere better.

Additionally, while some primers may offer benefits such as hydration or oil control, and can even assist with setting makeup, the core function of a primer is to ensure that the skin appears even and ready for makeup application. This foundational step is crucial for achieving longevity and a flawless look, making the creation of a smooth base the primary benefit of using a primer.