AI GEO

What is a Large Language Model (LLM)?

A large language model is an AI system trained on vast amounts of text data that can generate, summarize, translate, and answer questions in natural language.

Definition

A large language model (LLM) is an artificial intelligence system trained on massive datasets of text that can understand and generate human language. LLMs power the AI search and answer systems that are reshaping how people find businesses and information — including ChatGPT, Google Gemini, Claude, Perplexity, and Microsoft Copilot. When someone asks an AI assistant a question, an LLM is what reads the query, retrieves relevant information, and constructs the answer.

Why It Matters for Small Businesses

LLMs are the gatekeepers of AI-powered discovery. When an LLM generates an answer that recommends a business, that recommendation carries implicit authority. Understanding how LLMs work — what signals they use, what content they retrieve, what makes a source trustworthy in their eyes — is the foundation of every GEO and AEO strategy. Businesses that understand this have a meaningful advantage in AI visibility.

Example

A user asks ChatGPT to recommend a commercial cleaning company in their city. The LLM processes the query, retrieves content from sources it considers authoritative and relevant, and generates a response naming specific companies. The companies named are those whose entity signals, content quality, and citation consistency gave the LLM confidence to recommend them.

Related Terms

AI SearchSearch systems powered by LLMs

LLM CitationBeing named as a source in LLM-generated answers

Retrieval-Augmented Generation (RAG)How LLMs retrieve external content to answer questions

Generative Engine Optimization (GEO)Optimizing for LLM-powered search

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