The Webhook trigger in Flow allows you to initiate workflows by sending an HTTP request to a specified endpoint. This trigger is particularly useful for integrating external systems, services, or third-party applications with Flow. With the Webhook trigger, you can automate tasks and enable seamless data exchange between different platforms. 

When you choose the Webhook trigger in Flow, FLow will define an endpoint URL where the HTTP request should be sent. This URL acts as the entry point for triggering your workflow. Once a request is received at the specified endpoint, Flow will execute the steps defined in your workflow, enabling you to automate processes based on external events or actions.