What is the difference between ng-template and ng-container?

ng-template and ng-container are two structural directives in Angular that are used for rendering dynamic content in the HTML template.

Here is the difference between them:

1. ng-template is a directive that is used to declare a template reference variable. This template reference variable can be used to create a template dynamically and render its content at runtime. ng-template requires a name attribute to be assigned, which acts as a reference to the template.

Example:

<ng-template #myTemplate>
  <p>This is a template</p>
</ng-template>

2. ng-container is a directive that is used to group elements together without adding any extra HTML elements to the DOM. It is used to improve the readability of the HTML template and to wrap elements that need to be dynamically rendered.

Example:

<ng-container *ngIf="isVisible">
  <p>This is a dynamic message</p>
</ng-container>

In summary, ng-template is used to define a template, while ng-container is used to group elements together and render them dynamically.