A Gateway is represented by the familiar diamond shape and is used to control the divergence and convergence of Sequence Flow. Thus, it will determine traditional decisions, as well as the forking, merging, and joining of paths. Internal Markers will indicate the type of behavior control.
There are four types of gateways:
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Event
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Exclusive
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Inclusive: It indicates the evaluation of conditions to choose the route that will be followed. One or more routes can be taken.
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Parallel: It represents a synchronization point in which, in order to move forward with the flow, all tasks connected to this symbol have to be completed.
See Also
How to define conditions or events that determine the path(s) to follow
References
Introduction to BPMN
Business Process Modeling Notation (BPMN)