Magento 2: Add Custom Variable to Email Template

To add a custom variable to an email template in Magento 2, you need to define the variable in your code—typically by extending the email template variables via a custom module or observer. Then, reference the variable using {{var your_custom_variable}} in the email template. This allows dynamic, personalized content in automated Magento emails. Proper testing ensures the variable renders correctly in the final email.