- Small utility component that you can use in your applications to ease the management of dependencies between objects. The idea is simple, you have a factory object (we'll call this the *injector*) where you define some mappings. Each mapping has a unique id that you define. From different modules you can query the *injector* to give you a new instance of a specific mapping. Within classes you can define depenecies which will be satisfied on creation of a new instance of that class.