A dado joint is a woodworking joint that connects two pieces of wood at a right angle. It is created by cutting a groove, or dado, into one piece of wood, allowing the other piece to fit snugly into it. This type of joint is commonly used in furniture making and cabinetry, providing strength and stability. Dado joints can be made using various tools, such as a table saw or a router. They are often reinforced with glue or screws to enhance durability. This joint is particularly useful for creating shelves or partitions in cabinetry and bookcases.