AngularJS Tutorial: Introduction to AngularJS Scopes
By adding the ng-app directive to some HTML tag we specify that an AngularJS will be created and in the process of application creation Angular creates the so-called root scope. Some other directives such as ng-controller create a child scope. To visualize scopes one can use a Google Chrome extension called Batarang. The picture below shows the root scope for the AngularJS application and the child scope created by HelloController, which contains a single variable myModel.
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