Answer
Dependency Injection (DI) provides required objects from outside rather than creating them internally.
It improves modularity, testability, and maintainability.
Quick Answer
DI means giving a class its dependencies from outside rather than letting it create them itself. Instead of new SqlRepository() inside a service, you receive an IRepository through the constructor. Makes classes easy to test (swap real for mock) and keeps them loosely coupled. ASP.NET Core has DI built in.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ