Explain Dependency Injection and its types?

Dependency injection is a process where one static method or an object provides the dependencies of another object. Dependency injection is an object that can be used as a service. Dependency Injection can also be defined as the job of transferring an object to someone else by directly employing a dependency.

There is a total of three variants of Dependency Injection. They are:

1. Setter Injection: In this type of dependency, the client represents a method of the setter that an injector implies to insert the dependency.
2. Interface Injection: This dependency offers an injector method that will insert the dependency into the client that is passed to them.
3. Constructor Injection: This type of dependency is provided by the class constructors.