What components are included in the data layer within the principles of Clean Architecture?

In the principles of Clean Architecture, the data layer is responsible for working with data sources and typically includes the following components:

• Entities — business models that can be used in other layers but are often defined in the domain layer.
• Repositories — interfaces for data access, implemented in the data layer.
• Data Sources — specific implementations for data access, such as databases, network APIs, caches.
• DTO (Data Transfer Objects) — objects for transferring data between layers, often transformed into entities.

Thus, the data layer encapsulates storage and retrieval details, providing the domain layer with an abstraction through repositories.