In the context of software design, what is dependency injection?

Dependency injection is a design pattern that focuses on providing an object's dependencies from the outside rather than having the object create them itself. This approach promotes modularity, flexibility, and easier testing. By injecting dependencies, developers can easily swap out the implementations of those dependencies, making the code more adaptable to change and easier to maintain.

For instance, if an object depends on a particular service or component, instead of instantiating that component directly within the object, the component can be passed to the object via its constructor, a setter method, or an interface. This allows for better separation of concerns, as the object does not need to know about the specific classes it relies on, making it easier to manage, test, and reuse.

In contrast to the correct answer, the other options do not accurately reflect the essence of dependency injection. Handling exceptions pertains to error management, increasing complexity doesn't align with the goal of dependency injection, and simplifying algorithms is unrelated to the concept of managing dependencies among objects in software design.