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The joint technique used to join two pieces of wood at a right angle is called a butt joint. This technique involves aligning the end of one board directly against the face of another, thus forming a 90-degree angle. Butt joints are simple to create, requiring minimal tools and materials, which makes them a popular choice in various woodworking and carpentry projects.

In a butt joint, the surface area for bonding is relatively limited, leading to considerations regarding strength and stability, particularly in load-bearing applications. It's critical to use appropriate adhesives or fasteners to reinforce the connection, ensuring that it can withstand the intended structural demands.

The other joint types listed serve different purposes: the lap joint overlaps two pieces of wood, enhancing strength but not necessarily forming a right angle; the dovetail joint creates interlocking shapes that provide exceptional strength and aesthetic appeal, commonly seen in fine woodworking; and the mitre joint involves cutting the ends of two pieces at an angle to meet, which is often used in picture frames but doesn't inherently create a right angle at the join.