What type of makeup product is primarily used for evening out skin tone?

Foundation is primarily used for evening out skin tone as it serves as a base for makeup application. By providing a uniform color across the face, foundation helps to cover imperfections such as redness, discoloration, or uneven pigmentation. It is formulated to blend seamlessly into the skin and can come in various styles, including liquid, cream, powder, or stick forms, allowing it to cater to different skin types and preferences.

Other products like concealer might be used to target specific blemishes or dark circles, but they do not serve the broader purpose of evening out the entire skin tone. Blush adds color to the cheeks and enhances one's natural complexion but does not affect the overall skin tone. A highlighter is used to accentuate specific areas of the face for a luminous effect and does not serve the primary function of evening out skin tone.