This Fast food Activity Diagram is used to depict the flow of control in a system and to refer to the steps involved in executing a use case. Using activity diagrams, we model sequential and concurrent activities. So, using an activity diagram, we depict workflows visually. An activity diagram focuses on the flow state and the order in which it occurs. An activity diagram is used to describe or define what causes a specific event. UML primarily models three diagrams: structure, interaction, and behavior. It is a behavioral diagram that depicts a system's behavior. An activity diagram shows the control flow from a starting to a finishing point, highlighting the various decision points.
