Final answer:
A Business Process Model and Notation (BPMN) event is represented by a circle and signifies anything that happens during a business process.
Step-by-step explanation:
In a Business Process Model and Notation (BPMN), an event is represented by a circle and it signifies anything that happens during a business process. It can be a start event, intermediate event, or an end event. An event is a fundamental element in BPMN diagrams as it represents a state change or a trigger for a process.
For example, in a BPMN diagram, a start event can represent the beginning of a process such as receiving a customer order. An intermediate event can represent a decision point in the process, like receiving approval, and an end event can represent the completion of the process, such as delivering the product to the customer.