Introduction

In the ports and adapters model, the application is divided into two distinct parts:

• The "inside" part, which contains the business logic, including the use cases
• The "outside" part, which consists of adpaters that connect to external systems (e.g. datbases, web interfaces, 3rd party services)

The "ports" are interfaces that define how external systems can communicate with the application's business logic (use cases). Adapters implement these ports to translate between the external systems and the application's core logic.