What is the specificity of Backbone.js as a web development technology using MVC pattern ?

Backbone/Angular will allow you to structure your clientside Javascript into reuasable components like Models/Controllers/Views.

The advantages of using backbone are

- Produce structured / easy to maintain code

- Possiblty to unit test with Jasmine Framework.

- Easy to build single page apps.

I prefer AngularJs because of it is lightweight , less learning time and its from GOOGLE