Grill grates are the metal bars that form the cooking surface of a grill. They are typically made from materials like stainless steel, cast iron, or porcelain-coated steel. The design of grill grates allows for even heat distribution, helping to cook food thoroughly while creating appealing grill marks. These grates come in various sizes and shapes to fit different types of grills, including gas grills, charcoal grills, and electric grills. Proper maintenance, such as regular cleaning and seasoning, can extend the life of grill grates and enhance the flavor of grilled foods.