What is the difference between @Component and @Subcomponent annotations in Dagger in the context of dependency injection?

In Dagger, the annotations @Component and @Subcomponent are used to define dependency graphs but serve different roles:

• @Component — the main component that creates and provides dependencies. It is the root of the dependency graph and can include modules.

• @Subcomponent — a child component that inherits dependencies from its parent component and can add its own. It is used for more fine-grained organization of the graph, for example, for scopes with shorter lifetimes.

Differences:

• @Component creates an independent dependency graph.
• @Subcomponent depends on the parent component and can use its dependencies.
• A Subcomponent is declared inside a component or separately, but is linked to the parent through a method in the parent component.

Example:

@Component
interface AppComponent {
    Subcomponent.Builder subcomponentBuilder();
}

@Subcomponent
interface Subcomponent {
    @Subcomponent.Builder
    interface Builder {
        Subcomponent build();
    }
}