Dependency injection is a design pattern and a technique used to achieve loose coupling between classes and their dependencies. It involves injecting dependencies into a class rather than having the class create or manage them directly.
The benefits of dependency injection include improved code maintainability, testability, and flexibility. By separating the creation of dependencies from the class using them, replacing or modifying dependencies without impacting the class itself becomes easier.
This promotes code reusability, enhances unit testing capabilities by allowing the injection of mock objects, and facilitates modular and extensible design.