The language of AI commerce, in plain terms.

GTIN A Global Trade Item Number — the barcode standard that uniquely identifies a product worldwide. JSON-LD A way to embed machine-readable data in a web page — for commerce, a schema.org Product block with offers, price, availability and brand. Structured data Information about what a business offers, expressed in a fixed, machine-readable shape rather than free-form text — typically JSON-LD on the page or fields in a feed. Products, services, locations, plans and people each have their own type. LocalBusiness markup Structured data describing a physical business — name, address, phone, opening hours, and the area it serves — published in a form machines read directly. Answer share Across the buyer questions we ask on your behalf, the share of answers that name you at all — and, separately, where in the answer you're named. AI-referral traffic Visits that arrive at your site from an AI assistant rather than from a search results page, link or ad. E-E-A-T The signals that show a real, qualified organisation stands behind a page: named authors and practitioners, credentials and registrations, proof of outcomes, and independent reviews. Product feed A structured file (or API) listing your whole catalog with standardized attributes, submitted to a platform rather than crawled from pages. Agentic commerce Commerce where an AI assistant discovers, compares and sometimes purchases products on a shopper's behalf, rather than the shopper browsing a store. ACP An emerging protocol for how AI agents and merchants exchange product and order information so an assistant can transact reliably. UCP A proposed standard for exchanging catalog and commerce data between merchants and AI systems in a consistent, machine-first format. GEO vs SEO SEO optimizes to rank in a list of blue links; GEO optimizes to be the answer an AI assistant gives — read, trusted, and recommended. llms.txt A plain-text file at a site's root that summarizes what the site is and points to its key pages — a concise, machine-first map for language models.