How would you divide the architecture of an application being developed from scratch into main layers?

The application's architecture is usually divided into several main layers for easier maintenance and scalability:

1. Presentation Layer — responsible for displaying the interface and user interaction. In iOS, this is typically View and ViewController.

2. Domain Layer — contains the business logic, rules, and workflows of the application. Use Cases are implemented here.

3. Data Layer — responsible for data retrieval, storage, and processing, interacting with networks, databases, and caches.

This separation allows isolating logic from UI and data, facilitating testing and development.

Example structure:

• View / ViewController — display and handle user events
• Interactor / UseCase — business logic
• Repository — abstraction of data access
• Data Sources — specific implementations for API, database access

This aligns with architectures like Clean Architecture or MVVM.