What is the main difference between Activity Diagram and State Transition Diagram?

Activity Diagram focuses on documenting all possible states of an object, while State Transition Diagram depicts the order of actions and events.

Both Activity and State Transition Diagrams prioritize the representation of states within rounded rectangles, but they differ in the way they handle actions and events.

Activity Diagram shows the order in which actions take place and identify outcomes, while State Transition Diagram emphasize the events that affect an object's state changes.

Activity Diagram represents state changes with rounded rectangles, whereas State Transition Diagram illustrates the sequence of actions and events.