Gateway Interfaces for External Systems

In Clean Architecture, we want our core business logic to be independent of external details. This means not directly relying on specific databases, UI frameworks, or even external services.

Gateway Interfaces are your solution for communicating with these external systems without tightly coupling your core application to them.

Imagine your core logic directly calls an external email API. What happens if that API changes, or you want to switch providers?

• Your core code breaks.
• Testing becomes hard, needing real API calls.
• Your application is "coupled" to that specific external service.

Coupling makes your system rigid and difficult to change.