AngularJS is a structural framework for building dynamic single-page web applications. It was developed by Google to overcome limitations of HTML for building interactive web apps. Some key advantages include dependency injection, data binding, and directives that automate code and simplify development. While useful for many applications, it also has some disadvantages like potential memory leaks and lack of support for older browsers. Overall, AngularJS can significantly reduce development time and costs for building complex web applications.

1. AngularJS – What, Why,
Advantages and Disadvantages

2. Introduction
HTML was the perfect template language that will be used to declare such static
documents. However, web applications have taken over now, and they are way more
interactive & dynamic.
AngularJS is a structural framework that can be of help in using Single Page HTML
for declaring dynamic views in web-apps.
There are a range of benefits of this structural framework that make it the tool of
choice for modern-day web applications. It is designed by Google, and that happens
to be one of its prime advantages.
Developers also love its dependency injection as well as data binding, as this
ensures that a large part of the code that a programmer will write is now eliminated /
automated.
In short, AngularJS is attracting young programmers to learn the language and
clients to use this framework for their all-important web app projects.

3. What is AngularJS Used for?
Let us take some of the live examples of popular apps that use AngularJS:
Video Streaming Apps
User-Review Applications
Travel Apps
Weather Apps
User Generated Content Portals
E-commerce
Mobile Commerce
Social Apps
And many more….

4. Advantages Of AngularJS
Here are some of the compelling advantages of AngularJS:
Built by Google
Great MVC
Client side MVC framework
Declarative User Interface
Data models are POJO
Write less code
Intuitive
Comprehensive

5. Advantages Of AngularJS
Here are some of the compelling advantages of AngularJS:
DOM manipulations where they belong
Unit Testing Ready
Two-way data-binding
Directives
Dependency Injection
Flexibility with Filters
Template
Deep Linking

6. Disadvantages Of AngularJS
Here’s a compilation of some of the drawbacks of using AngularJs:
Confusion
Lagging UI
Name Clashes
JavaScript must be enabled in browser.
Memory leak in JavaScript can even cause powerful system to slow down the browser.
AngularJS works well only from Internet Explorer 8.0 on-wards and doesn't support any
older versions.

7. Reasons to Learn AngularJS
Here are some, which might catch your interest:
Quick Start
Time Saving
Fewer Codes
Data Binding is Easy
Declarative Expression of UI

8. Conclusion
 AngularJS is just the perfect framework for the development of dynamic
web apps. Not all web apps should use Angular.
 There are a range of examples to quote of large companies that make use of
AngularJS to support their projects.
 For a client, AngularJS can lead to time and cost savings. For young
learners, it presents with ultimate job opportunities to carve out a successful
career.

9. Source of Information:
 http://www.weblineindia.com/blog/angularjs-what-why-advantages-and-disadvantages/
 https://docs.angularjs.org/guide/introduction
 http://www.w3schools.com/angular/angular_intro.asp
 http://javaelegance.blogspot.com/2015/11/advantage-disadvantage-of-angularjs.html