Next.js is a React framework that works with Shopify in a headless setup. In this setup, Shopify manages the backend, and Next.js is used to build the frontend that customers see. It pulls data from Shopify using the Storefront API to show products, collections, and more. Next.js makes websites faster, better for SEO, and easier to customize. It also supports features like server-side rendering and static site generation. Many businesses use Shopify headless services with Next.js to create fast, modern, and flexible online stores that offer a better shopping experience.