What is the difference between activity diagram and state diagram?

State diagram shows the object undergoing a process. It gives a clear picture of the changes in the object's state in this process.
e.g: ATM withdraw
Card object state: Checking, Approving, Rejecting

Activity diagram is a fancy flow chart which shows the flow of activity of a process.
e.g: ATM withdraw
Withdraw activity: Insert Card, Enter PIN, Check balance, with draw money, get card

- Deepan

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