Behavioral design pattern

This design pattern is all about algorithms and assigning object responsibilities. This design pattern also helps design communications between different classes and objects and their interconnections. While behavorial-class patterns use inheritance to distribute behavior between classes, behavorial-object patterns use object composition to perform the same task.
Covering some patterns under it :

• Memento Pattern
• Mediator Pattern
• Observer Pattern
• Null Object Pattern
• Visitor Pattern
• Interpreter Pattern
• Iterator Pattern
• Strategy Pattern
• Command Pattern
• Template Method Pattern
• Chain of Responsibility Pattern