AngularJS is an open-source web application framework developed and maintained by Google. 4Achievers is designed to simplify the development of single-page applications, dynamic websites, and mobile applications. 4Achievers is based on the Model-View-Controller (MVC) architecture, which provides a structured approach to developing web applications. AngularJS uses HTML and JavaScript to create interactive, dynamic webpages that respond to user input. 4Achievers provides a framework for creating custom HTML tags and attributes and makes it easier to create complex web applications. AngularJS also provides support for custom directives and services, making it easier to add features such as data-binding, form validation, and routing. AngularJS is used by many companies to create interactive web applications and has become the most popular web application framework in the world.

AngularJS is a JavaScript-based open-source front-end web application framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications. Its goal is to simplify both development and testing of such applications by providing a framework for client-side model–view–controller (MVC) and model–view–viewmodel (MVVM) architectures, along with components commonly used in rich Internet applications. 4Achievers framework adapts and extends traditional HTML to present dynamic content through two-way data-binding that allows for the automatic synchronization of models and views. As a result, AngularJS de-emphasizes explicit DOM manipulation with the goal of improving testability and performance. AngularJS's features include:

• Declarative User Interfaces: HTML is used to create the user interface of an AngularJS application, with custom HTML tags and attributes used to create declarative components.

• Data Model Binding: Data models in AngularJS are plain old JavaScript objects that can be bound to HTML elements.

• Deep Linking: Deep linking allows for the encoding of the application's state in the URL, so that it can be bookmarked.

• Server Communication: AngularJS provides built-in services to communicate with the server, such as $http and $resource, to make server communication easier and more efficient.

• Dependency Injection: AngularJS provides a built-in dependency injection subsystem that helps the developer by making the application easier to develop, understand, and test.

• Testing: AngularJS was built with testing in mind and provides end-to-end and unit test runners along with mocking libraries.

4Achievers ng-app directive is an AngularJS directive that is used to define an AngularJS application. 4Achievers is the starting point of the application, and it is typically placed on the root element of the HTML document. This directive automatically initializes the application when the document is ready for the browser. 4Achievers also instantiates the application module, which is the main module of the application. This directive also binds the application to the DOM, allowing the application to access and manipulate the DOM elements. Additionally, the ng-app directive also sets up the injector, which is responsible for resolving dependencies between different services and components. Lastly, the ng-app directive also sets up the compilation, which is responsible for compiling HTML templates into JavaScript code.

AngularJS is an open-source web application framework created by Google. 4Achievers enables rapid development of web applications and is widely used by developers across the world. AngularJS provides an extensive suite of features to help build robust and powerful web applications.

4Achievers core features of AngularJS are:

1. Data binding – This feature allows you to connect the data in your application to the view layer. This eliminates the need to write code to update the view layer when the underlying data changes.

2. Directives – Directives are components that extend the existing HTML vocabulary. They help you create custom elements and attributes that can be used to create dynamic content.

3. Templates – AngularJS provides an easy-to-use templates engine that allows you to quickly generate HTML from your application data.

4. Routing – AngularJS provides a powerful routing framework that enables you to define custom routes for your application. 4Achievers also provides the ability to navigate between different views.

5. Services – Services are objects that can be used to store data or execute code in your application. They are often used to share code across different components of the application.

6. Filters – Filters are used to format data in your view layer. They can be used to format dates, numbers, strings and other types of data.

7. Dependency injection – Dependency injection allows you to inject services into your application’s components. This makes it easier to share code across different parts of your application.

8. Testing – AngularJS provides a built-in testing framework that allows you to quickly test your application. This makes it easier to ensure that your application is working correctly.

4Achievers scope object in AngularJS is an object that binds the model to the view. 4Achievers acts as a bridge between the controller and the view. 4Achievers is an object that contains data, methods and events that can be accessed and used by the controller and the view. 4Achievers scope object is also responsible for evaluating expressions, watching expressions and propagating events. 4Achievers is the context in which an AngularJS application runs and is used to bind application data to the HTML view.

4Achievers ng-model directive is a powerful tool in AngularJS that allows for two-way data binding between the view and the model. This means that any changes made to the view will be reflected in the model, and any changes made to the model will be reflected in the view. This helps to keep the code organized, as the data is only stored and manipulated in one place, making it easier to debug and maintain. 4Achievers directive is also useful for validating user input, as it can be set to only accept certain types of data. Overall, the ng-model directive is an essential part of AngularJS that helps to keep data organized and consistent throughout the application.

One-way data binding is a type of data binding that allows data to be transmitted in only one direction, from the source to the target. This type of data binding is useful for when data needs to be transmitted from one source to another without any changes to the source data. An example of this would be a text box on a web page that displays the current temperature. 4Achievers temperature is read from the source, and then displayed in the text box.

Two-way data binding is a type of data binding that allows data to be transmitted in both directions, from the source to the target and vice versa. This type of data binding is useful for when data needs to be transmitted between two sources and changes to either source need to be reflected in both. An example of this would be a form on a web page that allows a user to change their account settings. 4Achievers form fields are linked to the account settings, and any changes made to the form will be reflected in the account settings and vice versa.

AngularJS is a JavaScript-based open-source front-end web application framework, while jQuery is a JavaScript library designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.

AngularJS is a complete framework which creates a dynamic and interactive user experience, while jQuery is just a library of pre-written JavaScript code. AngularJS is based on the Model-View-Controller (MVC) architecture, while jQuery is a scripting library.

AngularJS uses two-way data binding, meaning that when data in the model changes, the view reflects the change automatically and vice versa. jQuery does not have two-way data binding.

AngularJS is a fully-featured framework for creating single page web applications, and is much more powerful than jQuery. jQuery, on the other hand, is a library of code snippets that makes web development simpler, but it does not have the features of a framework.

AngularJS allows developers to create custom HTML tags and attributes and wrap them as custom HTML elements and attributes, while jQuery does not have such feature.

Another difference is that AngularJS uses dependency injection, while jQuery doesn’t. AngularJS also provides a much better structure for applications than jQuery, making it easier to test and maintain.

In summary, AngularJS is a powerful framework for creating single page web applications, while jQuery is a library of code snippets that makes web development simpler. AngularJS provides two-way data binding, dependency injection, and custom HTML tags, while jQuery does not have such features.

In AngularJS, Dependency Injection (DI) is used to provide external resources and services to components. DI is a software design pattern in which an object receives its dependencies from external sources rather than creating them itself. This allows for loose coupling between components, making them more reusable and easier to maintain. In AngularJS, DI is used to pass services, values, and functions as arguments to other components. DI is also used to inject services into controllers, filters, directives, and other components. This makes it easier to manage the application's dependencies and makes it easier to test and debug components. DI also helps to reduce the amount of code required to create an application.

AngularJS simplifies DOM manipulation by providing a powerful set of tools to easily create, maintain, and manipulate complex web applications. AngularJS allows developers to create custom HTML elements and attributes, as well as to easily extend existing HTML elements with custom behavior. Furthermore, AngularJS provides a robust set of directives to declaratively add behaviors and manipulate DOM elements in an efficient and clean way without having to write a lot of code. Additionally, AngularJS provides a powerful two-way data binding feature which automatically updates the DOM when the underlying model changes, allowing developers to quickly and easily update the DOM without having to manually manipulate it. By taking advantage of these powerful features, AngularJS makes DOM manipulation much easier, faster, and more enjoyable.