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I am really unable to understand the real difference between these 2 diagrams. I mean both of these deal is "states" but I am not sure what deals with what?
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Differences Between Sequence Diagram and Activity DiagramThe Sequence diagram shows the message flow from one object to another object. The Activity diagram shows the message flow from one activity to another.
UML State machine diagram and activity diagram are both behavioral diagrams but have different emphases. Activity diagram is flow of functions without trigger (event) mechanism, state machine is consist of triggered states.
A state diagram, also known as a state machine diagram or statechart diagram, is an illustration of the states an object can attain as well as the transitions between those states in the Unified Modeling Language (UML).
An Activity in the activity diagram is also known as Activity state. It is used to represent the invocation of operation, a step in an entire business process. Swimlane is a way in which the performed activities can be grouped by the same actor on an Activity diagram.
It might seems so, but the difference is, activity diagrams describe activities and state charts describe states. So those models are orthogonal - you might imagine there is an activity between two states (something that occurs during the transition) and you might say there is a state between two activities. This is rather a simplification, but I think it might suffice to explain the difference, which is primarily focus, both diagrams are for describing behaviours.
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