message: docs: explicitly state purpose of components
  Current description is vague. I'd love to see this doc explicitly state that components are for reusable sets of UI features instead.
  PR Close
diff: @@ -149,8 +149,8 @@ Learn more: See the [Template Syntax guide](guide/template-syntax "Template Synt
  {@a components}
  ## Components
  -*Components* are the building blocks of Angular apps.
  -You've already been working with the product list component.
  +*Components* define areas of responsibility in your UI that let you reuse these sets of UI functionality.
  +You've already built one with the product list component.
  A component is comprised of three things:
  * **A component class,** which handles data and functionality. In the previous section, the product data and the `share()` method were defined for you in the component class.
  