Data Binding
One of the best features of AngularJS is the built-in data binding. Data binding is the process of linking data from the model with what is displayed in a web page. AngularJS provides a very clean interface to link the model data to elements in a web page.
In AngularJS data binding is a two-way process: When data is changed on a web page, the model is updated, and when data is changed in the model, the web page is automatically updated. This way, the model is always the only source for data represented to the user, and the view is just a projection of the model.
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