A foundation brush is a makeup tool designed to apply liquid, cream, or powder foundation evenly across the skin. It typically features a flat, dense bristle head that helps to blend the product seamlessly, providing a smooth and flawless finish. Using a foundation brush can enhance the coverage and longevity of the foundation compared to using fingers or sponges. These brushes come in various shapes and sizes, catering to different application techniques and preferences. Some popular types include the flat foundation brush, buffing brush, and angled foundation brush. Choosing the right foundation brush can significantly impact the overall makeup look.