The Bridge Pattern is a Gang of Four (GoF) structural pattern. It uses two layers of abstraction called abstraction and implementor. This design pattern decouples the abstraction from its implementation by using class hierarchies. The abstraction has the reference of the implementor. The implementor is an interface or abstract class which defines the behavior of concrete implementation. The abstractions and implementation can be extended and bound dynamically. Refined abstraction extends abstraction and hides its specific implementation from the implementor.