Features of NgModules

• Encapsulation: NgModule provides encapsulation by encapsulating components, directives, and pipes within a module, preventing naming conflicts and promoting modularity.
• Dependency Injection: NgModule facilitates dependency injection by allowing the registration of providers at the module level, making services available throughout the module and its components.
• Lazy Loading: NgModule supports lazy loading, enabling the loading of modules on-demand, thus improving application performance and reducing initial load times.
• Reusability: NgModule promotes code reusability by allowing modules to be imported into multiple feature modules, facilitating code organization and sharing across the application.

The NgModule decorator in Angular is like a blueprint for organizing and configuring different parts of your application. It’s like a set of instructions that tells Angular how to assemble the various components, directives, pipes, and services into cohesive units called modules. These modules help in managing dependencies, defining routing rules, and configuring providers.

Essentially, the NgModule decorator serves as a central hub for defining and organizing the building blocks of an Angular application, making it easier to develop, maintain, and scale complex web applications.

Angular NgModules are also classes with ‘@NgModule’ and it has metadata that describes how the different parts of the application will work together. Like javascript modules have their own files but NgModule does not have their own file, they only include metadata. it also helps to organize the components and services of the angular application.

Syntax:

import { NgModule } from '@angular/core';

@NgModule({
    declarations: [ /* Components, directives, and pipes */],
    imports: [ /* Other modules */],
    exports: [ /* Exports of this module */],
    providers: [ /* Services */],
    bootstrap: [ /* Root component */]
})

export class MyNgModule { }

Here, declarations is the array of components, directives, and pipes that belong to this module, imports is the array of other modules that this module depends on, exports is the array of declarations that should be visible and accessible to components in other modules, providers are the array of services available for injection within this module and bootstrap is the array containing the root component(s) to bootstrap when this module is loaded.