SEO & AI Glossary

A permanent HTTP redirect from one URL to another, passing most of the original URL's ranking signals to the new destination.

A temporary HTTP redirect that sends users and crawlers to a different URL without signalling a permanent change or transferring PageRank.

A temporary HTTP redirect that preserves the original HTTP method (POST, PUT) of the request when redirecting to the new URL.

A permanent HTTP redirect that preserves the original HTTP method of the request—the permanent equivalent of a 307.

Interfaces that incorporate true three-dimensional elements — rotated models, depth-driven layouts, parallax, and interactive 3D objects — within otherwise 2D screen contexts.

An HTTP response code indicating the requested page was not found on the server — the most common client-side error in web browsing.

An HTTP status code signalling that a resource has been permanently and intentionally removed from the server, with no forwarding address.

An HTTP server error indicating the server is temporarily unable to handle requests, commonly due to maintenance or overload.

A controlled experiment where two versions of a page, email, or ad are shown to different audience segments to determine which performs better.

An autonomous AI system that uses a language model to plan and execute multi-step tasks — calling tools, APIs, and other models — to achieve a goal without step-by-step human direction.

Systematic errors in AI outputs that result from biased training data or flawed model design, producing unfair or skewed results.

Tools and methods that attempt to identify whether content was generated by AI language models versus written by humans — with significant accuracy limitations.

The information a language model has access to when generating a response — the prompt, attached files, retrieved documents, conversation history, and system instructions.

A web crawler operated by an AI company to gather content for training datasets, real-time retrieval, or both.

When an AI model produces text that sounds confident but is factually wrong, made up, or inconsistent with the source material. Also called LLM hallucination or model hallucination.

Google's AI-generated summary that appears at the top of search results, synthesising information from multiple sources.

Search experiences powered by large language models that generate conversational answers, synthesise information from multiple sources, and reduce reliance on traditional blue-link SERPs.

A composite metric used by AI visibility platforms to summarize a brand's presence across AI engines — typically combining citation rate, sentiment, and share of voice.

Low-effort, mass-produced AI-generated content with no original insight, human editing, or first-party evidence — readable but valueless.

The extent to which a brand's content is referenced, cited, or surfaced in AI-generated answers from tools like ChatGPT, Gemini, and Perplexity.