Headless Shopify is a decoupled architecture that uses Shopify at the backend and any of Shopify Hydrogen, Vue Storefront, Nacelle, Fabric, Shogun, etc., at the front end. It separates the back-end from the front-end so that Shopify merchants get more control over their development and marketing experience. To call a store headless Shopify, you’ll have to use Shopify at the backend, not the front end.