The answer is Event.
A process-related event is described in a BPMN event, which is represented by a circle.
Start events, middle events, and end events are the three primary events in business process modeling.
These three categories are also described as throwing events or catching events (which respond to a trigger) (which the process triggers).
BPMN activity is a task in a business process.
In BPMN activity all work that is ongoing in a process is depicted by a rectangle with rounded corners in a business model.
It is used to verify availability, pick up clients, and booking confirmation.
BPMN gateway is used to control the flow of a process.
As represented by a diamond shape in a business process model, BPMN Gateway is used to manage the forking, merging, and joining of pathways inside a process.
Hence, a BPMN event is anything that happens during the course of a business process, including customer requests, time requests, and the end of the process.
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