AngularJS is an open-source JavaScript framework developed and maintained by Google. It's used for building dynamic and robust web applications.

Here's a complete guide to AngularJS:

1. Architecture: AngularJS follows a Model-View-Controller (MVC) architecture pattern. It separates the application's business logic from the presentation logic.

2. Directives: AngularJS provides a set of built-in directives that allow you to extend HTML with new attributes and elements. Directives are used to bind data to HTML elements, manipulate the DOM, and respond to user events.

3. Data Binding: AngularJS provides two-way data binding, which means that any changes to the model are automatically reflected in the view and vice versa. This makes it easy to keep the view in sync with the model.

4. Services: AngularJS provides a set of built-in services that allow you to create reusable components, such as HTTP requests, routing, and localization.

5. Dependency Injection: AngularJS uses dependency injection to manage the application's components and their dependencies. This makes it easy to write testable and maintainable code.

6. Testing: AngularJS provides a testing framework that allows you to write unit tests and end-to-end tests for your application.

7. Routing: AngularJS provides a powerful routing system that allows you to define routes for your application and handle navigation between them.

8. Filters: AngularJS provides a set of built-in filters that allow you to format and manipulate data before it's displayed in the view.

9. Modules: AngularJS uses modules to organize the application's components into logical groups. Modules can depend on other modules and can be reused across multiple applications.

10. Performance: AngularJS is optimized for performance, with features like lazy loading and caching built-in to improve the application's speed and responsiveness.

In conclusion, AngularJS is a powerful and flexible framework for building web applications. Its modular architecture, built-in directives, and two-way data binding make it easy to create dynamic and responsive user interfaces.

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