What are feature modules?

Feature modules are NgModules, which are used for the purpose of organizing code. The feature module can be created with Angular CLI using the below command in the root directory,

ng generate module MyCustomFeature //

Angular CLI creates a folder called my-custom-feature with a file inside called my-custom-feature.module.ts with the following contents

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

@NgModule({
imports: [
  CommonModule
],
declarations: []
})
export class MyCustomFeature { }

Note: The "Module" suffix shouldn't present in the name because the CLI appends it.