What is the primary purpose of foundation in makeup application?

The primary purpose of foundation in makeup application is to provide an even skin tone. Foundation serves as a base that helps to create a uniform appearance across the face by concealing imperfections such as redness, blemishes, and uneven skin texture. It helps smooth out the skin's surface and can enhance the overall look of the makeup by allowing other products, like blush and eyeshadow, to be applied more effectively. By providing this even canvas, foundation also ensures that the makeup looks cohesive and polished, making it an essential step in the makeup routine.