What are the elements which are used in activity diagrams?

The significant elements which are used in activity diagrams are:

• Activities - it indicates the action which has to be performed or had been performed in the system.
• Transitions - they are represented by an arrow and used to indicate the floor that is occurring among the elements in the diagram.
• Decision points - in the system the logical branching is highlighted by the decision points.
• States - these are indicated in order to mention the milestones for the processing of activity diagrams and is shown by a rounded rectangle.