Layered architecture is a software design architecture style that organizes a system into layers, each with a specific responsibility. Typically, the layers consist of:
- Presentation Layer: The top layer that handles user interface and user experience.
- Business Logic Layer: The layer that contains the core functionality and business rules of the application.
- Data Access Layer: The layer responsible for data storage and retrieval, often interacting with databases or external services.
- Integration Layer (Optional): The layer that manages communication with external systems or services, often through APIs or message queues.
In this model, we have user-interface components, which could be a web page, an API, or a CLI. These components communicate with the business logic layer, which contains our business rules and our workflows. Finally, we have a database layer, which is responsible for storing and retrieving data.