Dependency injection is a software design principle in which an object required by a function or method is supplied to it externally rather than being constructed internally, decoupling the creation of a dependency from its use. Dependency injection frameworks (e.g., a general-purpose library or a web framework's built-in mechanism) formalize this principle by standardizing how dependencies are declared, constructed, bound, and supplied to consumers, and by giving explicit control over object lifecycle (creation, scope, and teardown). This belongs to the domain of object-oriented software design and architecture, where it serves as one technique, among others such as abstraction via interfaces/protocols, for achieving loose coupling and testability.
Dependency injection is a software design principle in which an object required by a function or method is supplied to it externally rather than being constructed internally, decoupling the creation …