The principle behind joints and connections is that the pieces to be joined are designed to accommodate each other.
Among the most common joints are round and flat dowel joint, tenon joint, mortise joint and dovetail joint.
The round dowl joint require that the joint is made through wooden cylinders to be inserted into holes made in both pieces, while in flat dowel joint the joint is obtained with oval or elliptical plates.
Tenon and mortise joint is a male-female joint, in which one piece of wood has a rectangular protrusion (tenon) that fits into the recess (mortise) of the other wood.
In the dovetail joint, very solid and robust, a trapezoidal-shaped recess is made in one of the two pieces that fits into the trapezoidal extension on the other piece.
The joints can be tip (if they occur on the shortest side, as if they were an extension of each other), edge (if the connection occurs on the longest side, placing them side by side) or corner (in the case in which the chord forms a right angle).