Dependency Injection (DI) is a Design Pattern that involves providing a component with its dependencies instead of hard coding them within the component. This allows for greater flexibility and modularity in the design of software systems.
One of the main benefits of Dependency Injection is that it helps to decouple components from each other. This means that components are not dependent on each other for their functionality, and can be easily reused in different contexts. This allows for greater flexibility and maintainability of the system.
Another advantage of Dependency Injection is that it makes it easier to test components in isolation. Since the dependencies are provided to the component rather than being hard-coded, it is easy to substitute mock dependencies for testing purposes. This allows for more thorough testing of individual components without having to worry about the dependencies.
Dependency Injection is often used in Object-Oriented Programming languages, and is implemented using a Dependency Injection framework. These frameworks provide the necessary infrastructure for injecting dependencies into components at runtime.
In summary, Dependency Injection is a design pattern that allows for greater flexibility and modularity in software systems. It decouples components from each other and makes it easier to test individual components. It is implemented using Dependency Injection frameworks, and is commonly used in object-oriented programming languages.