Angular is an open-source web application framework primarily developed and maintained by Google and a community of individual developers and corporations. It is used for building dynamic, single-page web applications (SPAs) and provides a structured approach to web development by offering a comprehensive set of tools, libraries, and best practices.

Key features and concepts associated with Angular:

1. Component-Based Architecture: Angular applications are built using a component-based architecture. Components are the fundamental building blocks of an Angular application, each representing a part of the user interface. They encapsulate the HTML templates, styles, and logic associated with a particular part of the application .

2. Dependency Injection: Angular's dependency injection system helps manage the dependencies of different components, services, and modules. It promotes modularity and makes it easier to test and maintain the application.

3. Templates and Data Binding: Angular uses templates to define the structure of the user interface. Data binding mechanisms allow you to connect the template with the component's data, ensuring that changes in the data are reflected in the view, and vice versa.

4. Routing: Angular provides a router module that allows you to create single-page applications with multiple views. You can define routes and associate components with specific routes, enabling navigation within the application without the need for full page reloads.

5. Services: Services are reusable, injectable classes that encapsulate shared business logic, data retrieval, or other functionality that can be used across multiple components.

6. Directives: Angular offers a range of built-in directives that extend HTML with additional functionality. For example, the

7. HTTP Client: Angular provides an HTTP client module that simplifies making HTTP requests to remote servers or APIs, making it easy to fetch and send data.

8. Forms: Angular has robust support for both template-driven forms and reactive forms. These mechanisms simplify the process of creating, validating, and handling user input.

9. Testing: Angular is designed with testability in mind. It includes tools like TestBed and Jasmine for unit testing and end-to-end testing of applications.

10. Internationalization (i18n): Angular offers features for building applications that can be easily translated into multiple languages and locales.

11. CLI (Command-Line Interface): Angular CLI is a powerful command-line tool that helps developers scaffold, build, test, and deploy Angular applications efficiently.