What is a AngularJS ?

 AngularJS extends HTML to support dynamic applications which means it’s well suited for CRUD-centric types of applications. For example, it allows <option> tags in a <select> to be dynamically generated without having to write custom JavaScript code to perform that task, tracks changes made to UI elements and the data they’re bound to, provides filtering/sorting support, and much more

AngularJS frees you from having to do the following:

• Register callbacks
• Manipulate the DOM programmatically
• Move data in and out of the UI manually with code
• Writing a bunch of initialization code just to get started

Here’s a list of features that it provides out of the box.

• Data binding
• Data filtering/sorting
• Data templates
• Ajax support
• Form validation
• Routing
• History support
• Deep linking
• Modular and reusable components
• Loosely coupled architecture (dependency injection)
• MVC-style applications
• Architected with unit testing in mind

advantages and disadvantages of angularJS

AngularJS is a great choice if your are building a CRUD (create/read/update/delete) client side app that:
- can benefit from data-binding and automatic DOM manipulation which can be expressed via Angular's declarative templates
- if you are into writing succinct testable JavaScript code
- your app communicates with the server via XHR/JSONP

If your app is doing a lot of highly customized DOM manipulation, canvas or WebGL stuff, then Angular can still help you structure your app, but you will  need to do a lot of heavy lifting yourself (or with a use of other libraries).

 Client side Data binding and retrieve (CRUD)used an AngularJS.

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