Top 10 Angular Interview Questions frequently asked

What is Angular and how does it differ from AngularJS?
Angular is a TypeScript-based open-source web application framework developed and maintained by Google. It is the latest version of AngularJS, which is an older version of the framework. The main difference between Angular and AngularJS is that Angular is entirely rewritten in TypeScript, has a more modular architecture, and comes with improved performance and features compared to AngularJS.

What are the key features of Angular?
Angular comes with a number of key features that make it popular among developers. Some of the key features of Angular include:

• Two-way data binding
• Directives
• Dependency injection
• Services
• Templates
• Routing
• Forms
• Observables
• Pipes

What is TypeScript and why is it used in Angular?
TypeScript is a superset of JavaScript that adds type annotations to JavaScript code. It is used in Angular to help developers catch errors before runtime, improve code readability, and enable powerful refactoring features in modern code editors.

What is a component in Angular?
A component in Angular is a TypeScript class that interacts with the HTML template to display data to the user and respond to user actions. Components are the building blocks of an Angular application and are typically organized into a hierarchical structure.

What is a directive in Angular?
Directives in Angular are markers on DOM elements that instruct Angular to attach a specific behavior to the element. There are three types of directives in Angular: attribute directives, structural directives, and components.

What is Angular CLI and why is it used?
Angular CLI (Command Line Interface) is a command-line tool provided by Angular for creating, building, and maintaining Angular applications. It simplifies the development process by automating common tasks such as project setup, testing, and deployment.

What is dependency injection in Angular?
Dependency injection in Angular is a design pattern that allows you to pass dependencies (such as services or components) into a class or function. This makes your code easier to test, maintain, and extend by promoting loose coupling between different parts of your application.

What is routing in Angular?
Routing in Angular allows you to navigate between different components and views in your application based on the URL. It is used to define the mapping between URLs and the corresponding components to be displayed on the screen.

What are services in Angular?
Services in Angular are classes that provide a specific feature or functionality that can be shared across multiple components in an application. Services are typically used to encapsulate business logic, data retrieval, or other common tasks.