A box joint, also called a finger joint, connects two pieces of wood using alternating rectangular projections and recesses. The interlocking “fingers” create a larger gluing surface and are commonly used at the corners of boxes and drawers.
Accurate, evenly spaced cuts help the joint fit snugly and align the pieces. In a workshop, a jig can guide the workpiece and make the cuts repeatable, including when using a tool such as a stationary jigsaw. The term describes the woodworking joint, not a cybersecurity mechanism.