In order to use *ngIf without an extra element in Angular 2+, we can use either <ng-container> or <ng-template>
But in many cases, <ng-container> is recommended.
The best scenario regarding the usage of with *ngIf without an extra element is mentioned below.
javascript
html
Illustration of above code for ng-container 
But in many cases, <ng-container> is recommended.
The best scenario regarding the usage of with *ngIf without an extra element is mentioned below.
app.component.ts:
import { Component } from '@angular/core';
@Component({
selector: 'my-app-table',
template: './app.component.html',
styleUrls: [ './app.component.css' ]
})
export class AppComponent {
India=[{city:'Hyderabad'}, {city:'Mumbai'}]
}
app.component.html :
<h1>ng-container example</h1>
<div *ngFor="let state of India">
<ng-container *ngIf="state.city">
<p> {{ state.city }} </p>
</ng-container>
</div>
If we inspect it then we can see there is no extra element added after <div> tag and before <p> tag.
