Activity Diagram
An activity diagram is a visual representation of the steps (activities) involved in getting work done, with nodes representing those steps, and transitions between those activities. The most powerful activity diagram is one in which
swim lanes are used, which places each activity in a row or column represented by an actor. represents not only the activities links a stepwise activities and actions, with support for choice, iteration and concurrency. In the Unified Modeling Language, activity diagrams can be used to describe the business and operational step-by-step workflows of components in a system. An activity diagram shows the overall flow of control.