How are dependencies integrated into the main part of the domain model in the DDD approach?

In DDD (Domain-Driven Design), dependencies are integrated into the domain model through well-defined boundaries and contracts. The main idea is to isolate business logic from infrastructural details. Dependencies are injected via interfaces or abstractions to keep the domain model independent of specific implementations. For example, repositories or services are passed to domain objects through constructors or methods, allowing easy replacement of implementations and testing of logic without external dependencies.