Butt hinges are a type of hinge commonly used to attach doors to frames. They consist of two plates, called leaves, that are joined by a pin. One leaf is mounted on the door, while the other is attached to the door frame, allowing the door to swing open and closed. These hinges are typically made from materials like steel, brass, or stainless steel, providing durability and strength. Butt hinges come in various sizes and finishes, making them suitable for different types of doors, including interior and exterior applications. Their design allows for a clean and unobtrusive look.