This UML Activity Diagram Example is another important diagram in UML for describing the system's dynamic aspects. An activity diagram is a flowchart depicting the flow from one activity to another. The activity can be described as a system operation. The control flow is directed from one process to the next. This flow can be sequential or concurrent. Activity diagrams generally deal with all types of flow control by employing various elements such as fork, join, and so on. The basic functions of activity diagrams are similar to those of the other four diagrams. It captures the system's dynamic behavior. The other four graphs show the message flow from one object to another, but the activity diagram indicates the message flow from one thing to another.