Business events provide a mechanism that lets external systems receive notifications from Finance and Operations applications. In this way, the systems can perform business actions in response to the business events.
Business events occur when a business process is run. During a business process, users who participate in it perform business actions to complete the tasks that make up the business process.
A business action that a user performs can be either a workflow action or a non-workflow action. Approval of a purchase requisition is an example of a workflow action, whereas confirmation of a purchase order is an example of a non-workflow action. Both types of actions can generate business events that external systems can use in integration and notification scenarios.
b) Discussion of Business Events
Dynamics 365 Solution Architect