This diagram provides an overview of the interactions between different components of a system. It shows how different components interact with each other, and how they interact with the user. It also provides a visual representation of the system's architecture and how different components interact with each other. The diagram can be used
From Wikipedia
Interaction Overview Diagram is one of the fourteen "nominative" types of diagrams of the Unified Modeling Language (UML), which can picture a control flow with nodes that can contain interaction diagrams.