Blue cheese is a type of cheese known for its distinct blue or green veins, which are created by the mold Penicillium roqueforti. This mold is introduced during the cheese-making process, giving blue cheese its unique flavor and aroma. It is typically made from cow's, goat's, or sheep's milk and can vary in texture from creamy to crumbly. The taste of blue cheese is often described as sharp, tangy, and salty, making it a popular choice for salads, dressings, and cheese boards. Some well-known varieties include Roquefort, Gorgonzola, and Stilton. Blue cheese is also rich in nutrients, including calcium and protein.