Blue cheese is a bold and tangy cheese known for its distinctive blue or green veins, which are created by the intentional introduction of Penicillium mold during the aging process. It has a creamy to crumbly texture and a flavor profile that can range from salty and sharp to earthy and slightly sweet, depending on the variety. Commonly made from cow's, sheep's, or goat's milk, blue cheese is versatile in cooking and is often used in dressings, salads, sauces, or as a topping for steaks and burgers.