What are advanced Flow features like invocable actions, subflows, and fault paths?

Invocable Actions: Apex methods annotated with @InvocableMethod that can be called from Flows. They extend Flow capabilities beyond declarative limits (e.g., calling external APIs, complex calculations). Subflows: Allow one Flow to call another as a reusable module, passing variables in and out. This promotes reusability and maintainability. Fault Paths: In Flow, actions and DML operations can fail at runtime. Fault connectors route execution to a fault path where you can log the error, send a notification, or display a user-friendly message. Without a fault path, an unhandled error terminates the flow and shows a generic error. Debugging: Use the Flow Debug tool in Flow Builder or enable debug logs (Automated Flow Process user) to trace flow execution.