They describe how the resources modeled in the Structural diagrams interact and how they each execute their capabilities.
The behavioral diagram puts the resources in motion (In a dynamic style).
- This is in contrast to the structural view, which provides a static definition of the resources.

Interaction Diagrams

Each of these diagrams represents some aspect of the communication between objects to perform a task.
"Interaction" diagrams show the "dynamic model."
They show how objects interact at run time: how they act out a use case by sending messages to each other.
There are two sorts of interaction diagrams: Sequence Diagrams and Collaboration/Communication Diagrams.
- The two forms present identical information in a different way.