There are 5 Design Patterns: 1. The Factory Method - provides a simple decision making class that returns one of several possible subclasses of an abstract base class depending on the data that are provided. 2. The Abstract Factory Method - provides an interface to create and return one of several families of related objects. 3. The Builder Pattern - separates the construction of a complex object from its representation, so that several different representations can be created depending on the needs of the program. 4. The Prototype Pattern - starts with an initialized and instantiated class and copies or clones it to make new instances rather than creating new instances. 5. The Singleton Pattern - is a class of which there can be no more than one instance. It provides a single global point of access to that instance.