A cabinet door cannot function properly without hinges. Hinges can be categorized as either visible or invisible. Visible hinges date back to the original designs made by blacksmiths. They are composed of two leaves that are held together by a barrel-and-pin knuckle, allowing them to move in a linear direction. The completely exposed hinge usually has decorative details cast into its leaves, while partially concealed hinges only have the knuckle visible at the seam where the door aligns with the cabinet face frame. Partially concealed hinges are plain as they are only intended for function and not for decoration.
Invisible hinges, also known as Euro hinges, are set within the door and remain completely hidden when the cabinet is closed. They are becoming increasingly popular due to their practical benefits. For instance, invisible hinges can be aligned by adjusting the set screws. Additionally, invisible hinges usually feature an assisted return element in their construction, making them easier to use. This type of hinge also simplifies door removal as it allows the hinge to be disconnected at the joint while keeping its ends attached to the cabinet.