A cosmetic sponge is a soft, porous tool used for applying and blending makeup products, such as foundation, concealer, and blush. These sponges come in various shapes and sizes, allowing for precise application in different areas of the face. They can be used damp or dry, depending on the desired finish. Made from materials like latex or foam, cosmetic sponges are designed to create a smooth, even complexion. They are easy to clean and can be reused multiple times, making them a popular choice among makeup enthusiasts. Proper care extends their lifespan and maintains hygiene during makeup application.