What Is a Lightning Page?
Lightning Pages occupy a middle ground between page layouts and Visualforce pages. Like a page layout, Lightning Pages allow you to add custom items to a page. However, these items, instead of being fields or Visualforce components, are Lightning components, which allow much more flexibility.
You can use a Lightning Page to create an app home page that you can then add directly to the Salesforce1 navigation menu. An app home page is a mobile home page that enables your users to quickly access the objects and items that are most important in that app.
You can also assign global quick actions to a Lightning Page by specifying them in the Lightning Page XML. When users access the Lightning Page, any global actions that you’ve assigned to it will show up in the action bar at the bottom of the page.