As the name suggests, behavioral design patterns are patterns about how objects or classes interact with each other. The implementation of behavioral design patterns usually requires certain data structures to support the interaction in a system. However, behavioral patterns and structural patterns focus on different aspects when applied. As a result, you might find patterns in the category of behavioral design patterns usually have simpler or more straightforward structures compared to structural design patterns.
In this chapter, we are going to talk about some of the following common behavioral patterns: