text=A state machine is a model element that represents the dynamic behavior of a classifier, operation, or package. More specifically, state machines represent the event-driven aspects of system behavior. State machines represent the various states an object goes through during its lifetime in response to events. Not all objects require state machines. 
You can model state machines using two different UML diagrams:
	- Statechart diagrams
	- Activity diagrams (represented through activity graphs), used to model workflow between activities in a process.
Typically, you create statechart and activity diagrams to model classifiers, operations, objects, or entire systems.