What is design pattern?

• Recurring solutions to software design problems found in real-world application development.

GoF patterns groups (23):

• Creational:
• Abstract Factory:
• Builder
• Factory Method
• Prototype
• Singleton
• Structural:
• Adapter
• Bridge
• Composite
• Decorator
• Facade
• Flyweight
• Proxy
• Behavioral:
• Chain of Resp.
• Command
• Interpreter
• Iterator
• Mediator
• Memento
• Observer
• State
• Strategy
• Template Method
• Visitor