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 tasks. For example, a foundation brush is typically flat and dense, while a blush brush is softer and more rounded to create a natural look. These brushes are usually made from synthetic or natural bristles. Synthetic brushes are often preferred for liquid products, while natural bristles are better for powders. Proper care and cleaning of cosmetic brushes are essential to maintain their performance and hygiene, ensuring a flawless makeup application.