how ngif works in angular code example

Example 1: ng if

<div *ngIf="condition">

Example 2: ng-if

<label>Click me: <input type="checkbox" ng-model="checked" ng-init="checked=true" /></label><br/>
Show when checked:
<span ng-if="checked" class="animate-if">
  This is removed when the checkbox is unchecked.
</span>