What is Angular?

Angular is a TypeScript-based open-source front-end web application framework maintained by Google and a community of developers. It’s designed to make both the development and testing of such applications easier.

What is the difference between AngularJS and Angular?

AngularJS (Angular 1.x) is an older version of the framework, while Angular (2 and above) is a complete rewrite. Angular is more modular, supports two-way data binding, and is based on components, making it more efficient and maintainable than AngularJS.

Explain two-way data binding in Angular.

Two-way data binding in Angular means that changes in the UI (View) automatically update the application state (Model), and vice versa. It simplifies the process of keeping the model and view in sync.

What are Angular Components?

Components are the basic building blocks of an Angular application. They are reusable, self-contained units that encapsulate a part of the user interface and its logic.

What is Dependency Injection in Angular?

Dependency Injection (DI) is a design pattern in which a class receives its dependencies from external sources rather than creating them itself. Angular uses DI to provide components with the services they need.

Explain the role of NgModule in Angular.

NgModule is a decorator in Angular that helps organize and configure the application. It defines a module, which can include components, services, directives, and more. NgModule also helps with lazy loading and provides a compilation context for the components.

What is Angular CLI, and why is it used?

Angular CLI (Command Line Interface) is a powerful tool for initializing, developing, and maintaining Angular applications. It provides commands to create components, services, modules, and more, simplifying the development process.

What is the Angular Router?

The Angular Router is a module that enables navigation and routing in Angular applications. It allows you to define navigation paths, route parameters, and lazy-loaded modules.

Explain the purpose of Angular services.

Angular services are used to organize and share code across different components. They provide a way to encapsulate logic and functionality that can be shared throughout the application.

How does Angular handle forms?

Angular provides both template-driven forms and reactive forms. Template-driven forms are based on directives in the template, while reactive forms use a more explicit and component-based approach. Both approaches offer two-way data binding and validation.