Angular CLI, which stands for Angular Command Line Interface, is a powerful and essential tool for developers working with Angular, a popular front-end web development framework. Angular CLI simplifies the process of creating, developing, testing, and deploying Angular applications by providing a set of command-line commands and tools that automate many common development tasks.

One of the primary functions of Angular CLI is to generate the basic structure of an Angular application. Developers can use commands like ng new to create a new Angular project with all the necessary files and folders preconfigured. This not only saves time but also ensures that best practices and conventions are followed from the start. Apart from it by obtaining Angular Course, you can advance your career in Angular. With this course, you can demonstrate your expertise in applications using React concepts such as Angular Modules, Components, Databinding, Angular Forms, Angular Directives and Pipes, Services and Dependency Injection (DI), many more fundamental concepts, and many more. 

Angular CLI also provides commands for generating components, services, modules, and other Angular artifacts. This allows developers to create code scaffolding quickly and consistently, promoting code organization and maintainability.

Another crucial aspect of Angular CLI is its built-in development server. With the ng serve command, developers can start a local development server that automatically watches for changes in the code and updates the application in real-time. This feature greatly streamlines the development process, as developers can see immediate results as they make code modifications.

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For testing, Angular CLI integrates with popular testing frameworks like Jasmine and Karma, making it easy to write and execute unit tests and end-to-end (E2E) tests for Angular applications. The ng test and ng e2e commands facilitate running these tests and provide detailed reports.

When it comes to building production-ready applications, Angular CLI offers optimization features. The ng build command compiles and bundles the application code, optimizing it for production deployment. Developers can also use the --prod flag to enable additional optimizations like ahead-of-time (AOT) compilation, code minification, and tree-shaking to reduce the application's size and improve performance.

Furthermore, Angular CLI simplifies the deployment process by providing commands for deploying applications to various hosting platforms, including Firebase, GitHub Pages, and more. This streamlines the process of making Angular applications accessible to users on the web.

In summary, Angular CLI is an invaluable tool for Angular developers, streamlining the development, testing, and deployment processes of Angular applications. It automates common tasks, enforces best practices, and provides a standardized and efficient workflow for building modern web applications. Its command-line interface empowers developers to focus on writing high-quality code and delivering feature-rich, performant Angular applications.