How can dependency injection reduce coupling in your software design?

This description is accurate, but I think perpetuates an unfortunate view of DI. DI is an exceedingly useful design tool, to decouple software, its relationship with tools like Spring, Guice or Dagger, is completely incidental. whether it is popular or not. As a result beginners often confuse DI with the tools that rely on it. It is rather like saying that TDD is DI, because TDD often works best in combination with DI, using the injection of fake versions of the dependency so that we can use that as a "measurement point" in a test.

Dependency injection reduces coupling in software design by decoupling the creation and binding of dependent objects from their behavior. This allows components to be easily replaced, modified, or tested independently, promoting more modular, flexible, and maintainable code.

Dependency injection provides the advantage of decoupling components, making it easier to replace and reuse code, while also enhancing readability and maintainability. However, its initial implementation can bring complexity and potential overhead, requiring a learning curve and care to avoid excessive abstractions. In summary, considering the points above, I deem dependency injection essential as it fosters flexibility and modularity, allowing components to be easily replaced, reused, and tested independently. This fosters a more robust and adaptable architecture, facilitating software evolution over time.

While dependency injection is a useful tool to decouple an object from the creation of its dependencies, there will still be coupling to the interfaces of those dependencies or their implementation. Therefore, the relation and demarcation of dependency injection to / from the dependency inversion principle should be stated clearly, in order to avoid confusion of both terms. Both are abbreviated with DI.

This seems to completely miss the point. The true intent of dependency injection is to achieve dependency INVERSION through programming to an interface. The primary concern is not to make mocking in tests easier. That’s a bonus feature. But rather the real benefit is when we are able to swap dependencies in production code. As a result, engineers can isolate the code they are currently working with from its dependencies, making it easier to fit inside their brain. Additionally, the code is made more agile since changes can be made in one place without causing a cascade of changes.

The design value of DI massively outweighs the advantage of DI containers, you can do everything the container can do, without the container. This doesn't mean that DI containers are useless, but they are merely tools that rely on DI and not an essential component of it.

Dependency Injection (DI) reduces coupling in software design by allowing components to depend on interfaces or abstractions rather than concrete implementations. This inversion of control makes it easy to swap out dependencies, enhancing flexibility, testability, and maintainability. DI ensures that components can be developed, tested, and maintained independently, leading to a more modular and scalable system.

Using constructors to inject dependencies keeps code leaner and avoids bloat by only injecting required services. It also makes code easier to maintain and write test cases for.