What does dependency injection help enhance in software?

Dependency injection is a design pattern that promotes the separation of concerns within a software application. By allowing an object to receive its dependencies from an external source rather than creating them internally, this approach enhances code modularity and testability significantly.

When code is modular, various components can be developed and maintained independently. This means that each module has a clear responsibility, making it easier to understand and modify without affecting other parts of the system. Dependency injection facilitates this by ensuring that components can be easily swapped or modified by altering their dependencies, rather than changing the components themselves.

Testability is also improved through dependency injection because it enables developers to provide mock implementations of dependencies when testing a component. This means that unit tests can run in isolation, allowing for more reliable and focused testing scenarios. This leads to easier identification of bugs and ensures that individual components function as intended without reliance on their real dependencies.

In contrast, the other options do not align as closely with the core benefits of dependency injection. Performance and speed of execution may not necessarily improve because the pattern can introduce an overhead in managing object lifecycles. Security and data integrity are more influenced by broader architectural choices and coding practices than by dependency injection itself. User experience and interface design involve aspects of design and usability that are