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Dependency Injection (Injectors (Injector hierarchy (Module injectors (For…

- - - - Isolates services to the smallest possible scope to reduce chances of errors
    - - Service is provided in an editor component
      - Persists state for one particular component
    - - Provide more specialized services down the component hierarchy
  - - - Shared by all running apps
      - Used internally during bootstrap
    - - Default for CLI-generated services
      - Lifetime of the app
    - - For services provided in lazy-loaded modules
      - Lifetime of the module
      - Overrides services configured with the root injector if added to the AppModule
    - - Lifetime of the component instance
      - An injector for each component instance
    - - Component injectors belong to the instance's anchor element in the DOM
      - Directives and components on the same anchor element share an injector