This chapter covers the Factory Method pattern.
To better understand this pattern, I suggest you first read Chapter 24, which covers the Simple Factory pattern. The Simple Factory pattern does not fall directly into the Gang of Four design patterns, so it appears in Part II of the book; however, the Factory Method pattern will make more sense if you first understand the pros and cons of the Simple Factory pattern.
GoF Definition
Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation ...