What is Dependency Injection (DI) in ASP.NET Core?

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Dependency Injection in .NET is a design pattern that promotes loose coupling and enhances testability by injecting dependencies.

Promotes loose coupling by separating the creation of a class's dependencies from its behavior.
Facilitates easier unit testing by allowing mock dependencies to be injected.
Commonly implemented using interfaces and inversion of control (IoC) containers.
Example: In ASP.NET Core, services are registered in the Startup.cs file using 'services.AddTransient()'.
Supports various lifetimes: Transient, Scoped, and Singleton, allowing control over the lifespan of dependencies.

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