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There are three main classifications of design patterns, based on their purpose:

• Creational: Related to object creation. They help make the system independent of the way objects are created, composed, and represented.
  • Factory Method
  • Abstract Factory
  • Builder
  • Singleton
  • Prototype
• Structural: Explain how larger structures are formed from classes and objects.
  • Adapter
  • Bridge
  • Composite
  • Decorator
  • Facade
  • Flyweight
  • Proxy
• Behavioral: Define algorithms of interaction between objects and the distribution of responsibilities among them.
  • Chain of Responsibility
  • Command
  • Interpreter
  • Iterator
  • Mediator
  • Memento
  • Observer
  • State
  • Strategy
  • Template Method
  • Visitor

There is also a classification based on the level of application:

• Class Patterns: Describe static relationships between classes (inheritance).
• Object Patterns: Describe dynamic relationships between objects (composition).

For example:

Category	Type	Example
Creational	Object	Factory Method
Structural	Class	Adapter
Behavioral	Object	Strategy