Dependency Injection

Dependency Injection (DI) is a design pattern in software development that simplifies the management of object dependencies, making applications more modular and testable. Instead of a class creating its dependencies directly, DI allows those dependencies to be provided externally, typically through a constructor, method, or property. This separation of concerns promotes loose coupling between classes.

DI enhances code maintainability by making it easier to replace or modify dependencies without altering the dependent class. It also facilitates unit testing by allowing the injection of mock or stub dependencies. Common DI frameworks like Spring (Java) or .NET Core (C#) automate the process, improving development efficiency.

By abstracting how objects acquire their dependencies, DI adheres to the Dependency Inversion Principle of SOLID design, ensuring that high-level modules are not tightly bound to low-level implementations. In essence, DI fosters flexibility and scalability in modern software design.