How to Create a CSV File to Download using Magento 2?

Create Export and Download CSV, Excel or Text File Programmatically in Magento 2 by FileFactory Class.

\Magento\Framework\App\Response\Http\FileFactory used to create CSV and download CSV by Magento way. create() function in FileFactory.php is used for create CSV file.

There are many other ways to download CSV files using Core PHP script but its not the best way to use within the Magento Coding standard.
You can write CSV and download a CSV file using just simple below code snippet in your controller file,

When you run controller action you can download CSV file using just Magento straight forward way.
Using the above way you can download CSV file using Magento 2 Way.

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