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AngularJS is a JavaScript-based open-source web application framework led by the Angular Team at Google.
AngularJS, also known as Angular 1, is an open-source JavaScript framework developed by Google. It is designed for building dynamic web applications with a focus on enhancing the functionality and interactivity of HTML-based user interfaces.

Key features and concepts of AngularJS include:

Two-Way Data Binding: AngularJS provides a powerful two-way data binding mechanism, which means that changes made in the user interface (UI) are automatically reflected in the underlying data model, and vice versa. This simplifies the synchronization of data between the UI and the application's logic.

Directives: AngularJS uses directives to extend HTML with custom tags or attributes. Directives allow developers to create reusable components, manipulate the DOM (Document Object Model), and enhance the behavior of HTML elements. AngularJS comes with built-in directives, such as ng-repeat for repeating elements and ng-model for binding data to input fields.

MV* Architecture: AngularJS follows the Model-View-Controller (MVC) or Model-View-ViewModel (MVVM) architectural pattern. It encourages the separation of concerns by dividing the application into distinct components. The model represents the data and business logic, the view handles the presentation and UI, and the controller or view model manages the interaction between the model and the view.

Dependency Injection: AngularJS provides a powerful dependency injection mechanism that simplifies the management of dependencies between different components of an application. It allows for loosely coupled and modular code, making it easier to test and maintain.

Templating: AngularJS uses HTML templates to define the structure and layout of the application's UI. Templates can include expressions, filters, and directives to dynamically display data and manipulate the DOM based on the application's logic.

Services: AngularJS includes various built-in services that provide common functionalities, such as HTTP communication, data caching, and logging. Developers can also create their own custom services to encapsulate reusable business logic.

Testing: AngularJS has good support for unit testing and provides tools for writing testable code. The framework includes dependency injection and mocks, which facilitate the creation of testable components.

Routing: AngularJS offers a routing mechanism that enables developers to define different routes within an application and associate each route with a specific template and controller. This allows for the creation of single-page applications where different views can be loaded dynamically without full page refresh.

Extensibility and Community: AngularJS has a large and active community of developers, which has resulted in a vast ecosystem of third-party libraries, tools, and extensions. Developers can leverage these resources to enhance the capabilities of their AngularJS applications.

It's worth noting that AngularJS is the first version of Angular and has been superseded by Angular, also known as Angular 2+. The newer versions of Angular introduced significant changes and improvements, including a rewritten architecture, enhanced performance, and additional features. However, AngularJS still remains in use in many existing applications and legacy systems.