This is the legacy version of Hydrogen, a framework Shopify built for creating custom online stores powered by the Shopify platform. The active, maintained version now lives in a separate repository at github.com/Shopify/hydrogen. This repository is preserved for teams that built on the original version and have not yet migrated. Hydrogen is built with React, which is a popular JavaScript library for building web interfaces. The framework is specifically designed for building storefronts, meaning the customer-facing part of an online shop: product pages, collections, carts, checkout flows, and similar features. Rather than using Shopify's standard hosted themes, Hydrogen lets developers build completely custom shopping experiences that connect to Shopify's back end for inventory, orders, and payments. The README for this version is minimal. It confirms the framework uses React and Shopify's infrastructure, provides installation commands to create a new project, and shows how to start a local development server. Beyond that, it refers readers to the documentation site for more detail on getting started. If you are looking to build a new Shopify storefront, the current Hydrogen repository is the right place to start. This legacy version is no longer actively developed. The README itself flags this at the top with a warning, noting the current version is available elsewhere.
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