# Business Glossary

## Celonis Event Triggering

| **Term** | **Description** |
|  --- | --- |
| Knowledge Model (KM) | The process context semantics. It is a collection of reusable knowledge entities on top of a business process defining a use case. Refer to the [Celonis Documentation](https://docs.celonis.com/en/knowledge-models.html). |
| KM Trigger | A predefined message structure emitted by Celonis when a business condition occurs. Refer to the [Celonis Documentation](https://docs.celonis.com/en/triggers.html). |
| Subscription | A subscription to a KM Trigger is a registration indicating that the owner is ready to receive messages at their callback webhook when the triggering event occurs. The owner is responsible to manage their subscription lifecycle. |
| Event Message | The message forwarded to a 3P webhook when the triggering event occurs. |
| 3P Webhook | It is an integration that automatically sends data (the triggering events) between Celonis and 3P applications via HTTP. |