Dependency Injection (DI) is a design pattern where a component receives its dependencies from an external source rather than creating them internally, promoting loose coupling, testability, and maintainability.
Dependency Injection (DI) is a technique where an object receives the objects it depends on (its dependencies) from an external source (like a container or a factory) rather than creating them internally. This pattern is fundamental to writing modular, testable, and maintainable code. It adheres to the Inversion of Control (IoC) principle, where the control of creating and managing dependencies is transferred from the component to an external system. This makes components easier to test (by injecting mocks), reuse, and replace without modifying the component itself.