$scope in Angular

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What is scope in Angular?

Scopes provide APIs ($watch) to observe model mutations

Scopes provide APIs ($apply) to propogate any model changes through the system.

Scope is the glue between the application controller and the view

During the template linking phase, the directives set up $watch expressions on the scope.

It gives you access to your models

Think about it: if you set up a model in a view and wish to access it in a controller then you do that via $scope.