Next.js Commerce is the architecture and practice of building full-stack e-commerce platforms using Next.js 13+, TypeScript, Stripe, and a relational database (PostgreSQL). It covers the entire stack: product pages, shopping cart, checkout flow, payment processing, order management, and customer accounts. Unlike traditional monoliths or Shopify themes, Next.js Commerce gives you raw control over UX, integrations, and scaling. You own the server logic (inventory management, pricing rules, taxes), client rendering (fast product pages, cart state), and payment flow (Stripe webhooks, idempotency).