A dovetail is a joining technique in woodworking. The actual dovetail definition is this:
A joint formed by one of more tapered projections on one piece that interlock with corresponding notches or recesses in another.
Detailed Dovetail Definition
The dovetail is often used due to its resistance to being pulled apart. The sides of drawers are common places where one may find a dovetail joint. The two components of a dovetail are tenons and mortises. The shape of the dovetail tenons and mortises are a fan, which resembles a dove's tail, hence the name.