What is Angular JS?
AngularJS is a structural javascript framework, that helps to build dynamic web applications.
Note: For interview purpose above line is enough :)
Some more details:
It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. Angular's data binding and dependency injection eliminate much of the code you would otherwise have to write.
HTML is a great declarative language for static documents.
Why AngularJS?
HTML is great for declaring static documents, but it falters when we try to use it for declaring dynamic views in web-applications. AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
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