Cosmetic sponges are soft, porous tools used for applying and blending makeup products like foundation, concealer, and blush. They come in various shapes and sizes, allowing for precise application in different areas of the face. Many sponges are made from materials like polyurethane or latex, which help achieve a smooth finish. To use a cosmetic sponge effectively, it can be dampened with water to enhance its texture and make blending easier. After use, it's important to clean the sponge regularly to prevent the buildup of bacteria and ensure a flawless makeup application each time.