Cosmetic brushes are tools used for applying makeup products like foundation, blush, and eyeshadow. They come in various shapes and sizes, each designed for specific applications. Common types include foundation brushes, blush brushes, and eyeshadow brushes, which help achieve a smooth and even finish. These brushes are typically made from synthetic or natural bristles. Synthetic brushes are often preferred for liquid products, while natural brushes are favored for powders. Proper care and cleaning of cosmetic brushes are essential to maintain their quality and prevent the buildup of bacteria, ensuring a flawless makeup application.