Angular's default change detection strategy checks components at predefined intervals. It periodically scans all components in the application for changes, which can be resource-intensive. This approach is less efficient than the OnPush strategy because it checks components even when no relevant changes have occurred. User interaction and asynchronous data arrival do not directly trigger checks in the default strategy.

In Angular, it's best to use the ngOnInit lifecycle hook to handle any additional initialization tasks, including making HTTP requests. The constructor is mainly used for dependency injection and not for logic.

When ViewEncapsulation.Native is used, the styling is encapsulated using the browser's native Shadow DOM. Shadow DOM is a web standard that provides encapsulation of styles and markup, ensuring that styles in one component do not affect styles in another. It's a key feature in achieving component-based styling in Angular.

The primary purpose of the Validators class in Angular's Reactive Forms is to define validation rules for form controls. It provides a set of built-in validator functions that you can use to ensure that user input meets specific criteria, such as required fields, email formats, and custom validation logic. The other options do not accurately describe the role of the Validators class.

The process of synchronizing the UI with the underlying form model in Reactive Forms is called "model binding." It involves binding the form controls in your UI to the corresponding values in the form model, ensuring that any changes in the UI are reflected in the form model and vice versa, maintaining a two-way data binding relationship.

To integrate a third-party library into an Angular application and ensure it works seamlessly with Angular's form controls, you should create a custom Angular form control wrapper around the date picker. This wrapper will bridge the gap between the library and Angular's forms, enabling you to interact with the date picker as if it were a native Angular form control. Using Angular's built-in form controls for the date picker may not be feasible if the library doesn't support them natively. Rewriting the entire library or abandoning it is typically not the most efficient solution.

To validate form fields against data from a backend API in Angular, you should implement asynchronous validators in Angular's Reactive Forms. These validators allow you to make asynchronous API calls to validate form data. Using the JavaScript fetch API directly is possible but not as integrated and flexible as Angular's Reactive Forms. Angular's built-in server-side validation is a server-side concern and does not directly relate to Angular's validation. Template-driven forms do not provide the same level of control and flexibility for asynchronous validation as Reactive Forms.

In Angular, the RouterModule is primarily used for setting up routing. It provides the necessary tools and components to configure routing in an Angular application. While NgModule is a fundamental building block in Angular, it's not specifically designed for routing. AppRoutingModule and RoutingModule are commonly used names for the routing module in many Angular projects.

To execute multiple HTTP requests in order, one after another, you should use the concatMap operator from RxJS. concatMap maintains the order of execution by waiting for each request to complete before starting the next one.

In Angular, to make a service available to the entire application, you should set its 'providedIn' property to 'root'. This ensures that the service is provided at the root level injector, making it accessible throughout the application. Using 'root' is the recommended approach for most services in Angular applications.