The tutorial explains how to send a vCard using PHP and WhatsApp with the help of Twilio's API. A vCard is an electronic form of a business card that can contain contact details such as names, addresses, phone numbers, and URLs. The tutorial covers the prerequisites for the project, including installing required dependencies, setting environment variables, and writing the PHP code to create and send a vCard via WhatsApp. The code uses the sabre/vobject package to simplify creating vCard files and the Twilio PHP Helper Library to interact with Twilio's APIs. After writing the code, the tutorial tests the application by starting ngrok and running a curl command to test the WhatsApp message sending functionality.