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In a multi-module application, interaction between them can be implemented in several ways:

• Using interfaces and abstractions: each module provides interfaces that other modules can use without knowing the implementation details.
• Event-driven architecture: modules exchange events via an event bus or using the Observer pattern.
• Dependency Injection (DI): dependency injection allows modules to obtain necessary objects from an external container, simplifying interaction and testing.
• Using shared data models and DTOs: for data transfer between modules.

For example, in Android, architectural components like ViewModel and LiveData can be used so that one module publishes data and another subscribes to changes.