The NgModule is a TypeScript class marked by the @NgModule decorator.
The module is a class and works with the @NgModule decorator function and also takes a metadata object that tells Angular how to compile and run module code.
The Angular module helps you to organize an application into associative blocks of functionality.
An angular module represents a core concept and plays a fundamental role in structuring Angular applications.
The NgModule is used to simplify the ways you define and manage the dependencies in your applications and also you can consolidate different components and services into associative blocks of functionality.
Every Angular application should have at least one module and it contains the components, service providers, pipes and other code files whose scope is defined by the containing NgModule.
The purpose of the module is to declare everything you create in Angular and group them together.