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  1. $rootScopeProvider
  2. service in module ng

Every application has a single root scope. All other scopes are descendant scopes of the root scope. Scopes provide separation between the model and the view, via a mechanism for watching the model for changes. They also provide event emission/broadcast and subscription facility. See the developer guide on scopes.

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https://code.angularjs.org/1.6.5/docs/api/ng/service/$rootScope