In UML, what is the function of an activity diagram?

An activity diagram in UML serves the purpose of modeling the workflow of a system. This type of diagram is primarily focused on the flow of activities and the sequencing of actions or tasks involved in a particular process. It highlights the various activities, the conditions for their execution, and how they are interconnected, making it an effective tool for visualizing and understanding complex processes within a system.

Activity diagrams can illustrate parallel processes, decision points, and the flow from one activity to another, allowing stakeholders to grasp the workflow comprehensively. This is crucial for identifying inefficiencies or areas for improvement in a system's operations, facilitating better communication among team members and stakeholders involved in system design and implementation. By capturing the dynamics of a workflow, activity diagrams help to ensure that all aspects of a process are considered and effectively represented.