1. What is an NgModule
An NgModule groups related components, directives, and pipes together. It was the primary way to structure Angular apps before standalone components arrived in Angular 14.
NgModules are not deprecated — they are still fully supported in Angular 21. Only platformBrowserDynamic (the old bootstrap function) was deprecated. The recommended path for new projects is standalone components, but NgModules remain valid for existing codebases.
2. NgModule Anatomy
The @NgModule decorator accepts five main properties:
