What is Barryvdh\DomPDF ?

Barryvdh\DomPDF is a package for the Laravel PHP framework that provides integration with the DomPDF library. Laravel is a popular PHP web application framework, and DomPDF is a PHP library that allows for the creation of PDF documents from HTML content. Barryvdh\DomPDF simplifies the process of using DomPDF within Laravel applications.

Error :-

 Class "Barryvdh\DomPDF\Facade\Pdf" not found

Solution :-

composer require barryvdh/laravel-dompdf

Step 2 : In ..\config\app.php

'providers' => [ 
  .....
  Barryvdh\DomPDF\ServiceProvider::class,
],
'aliases' => [
  .....
 'PDF' => Barryvdh\DomPDF\Facade::class,
]

Now its working.