What is Dependency Injection and why is it useful?

Dependency Injection (DI) is a design pattern that allows an object to receive its

dependencies from an external source rather than creating them itself. This promotes loose

coupling, enhances testability, and simplifies code maintenance.

Benefits:

• Improves modularity
• Enables easier unit testing (via mock dependencies)
• Promotes adherence to SOLID principles (especially the Dependency Inversion

Principle)