Pocket hole joinery is a way of making strong, hidden joints by drilling a hole at an angle of 15 degrees. These joints are fast and easy to produce. 

Simply drill a hole a into one work piece, then join it to a second work piece with a self-tapping screw. Because the screws act as an internal clamp holding the joint together, glue is unnecessary (but usually recommended) for most common joints.

Compared to the traditional joinery methods of dowel or mortise and tenon joints, pocket hole joints;  

• Require only one hole to be drilled, eliminating the need to precisely line up mating work pieces.
• Do not require any complex mathematics or measurements.