[Glossary](https://telxpress.com/glossary/) / AI # Retrieval-augmented generation **Retrieval-augmented generation** (RAG) is a technique in which an AI system first looks up relevant documents or records and then answers from them, so replies are grounded in your information rather than the model's memory. - AI - Updated October 11, 2026 - Written by the Telxpress advisory team 01 In depth ## What it is, why it matters and *what to ask a vendor* A language model alone answers from what it absorbed in training, which can be out of date or simply wrong about your business. With retrieval-augmented generation the system searches an approved source (your price list, policies, service manuals, the caller's account) and hands the results to the model with instructions to answer from them and to say so when the answer is not there. This is how an AI voice agent knows your hours, your service area and your cancellation policy without being retrained, and how a support assistant quotes the right manual. For a growing business it also means the content you maintain is the content the AI uses, so keeping documents current becomes an operations task. Ask a vendor what sources the system retrieves from, how often they are refreshed, whether it cites or logs the source it used, what it says when nothing relevant is found, and how you correct a wrong answer. A demo on your own documents is worth more than any benchmark. 02 Related terms ## Terms that usually come up *alongside it* - AI ### [Large language model](https://telxpress.com/glossary/large-language-model/) A large language model (LLM) is an AI system trained on vast amounts of text that can follow instructions and generate fluent language; it powers chat assistants and the conversation in AI voice agents. - AI ### [Hallucination](https://telxpress.com/glossary/hallucination/) A hallucination is a confident but false statement produced by an AI model, such as an invented policy, price or appointment slot, and it is the main accuracy risk in any customer-facing AI system. - Voice ### [AI voice agent](https://telxpress.com/glossary/ai-voice-agent/) An AI voice agent is software that answers phone calls in natural conversation, understands what the caller wants, answers questions, books appointments and transfers or takes messages when a person is needed. - AI ### [AI governance policy](https://telxpress.com/glossary/ai-governance-policy/) An AI governance policy is the written set of rules a business adopts for how AI tools may be used, what data they may touch, who approves them and how their output is checked. 03 At Telxpress ## Where this shows up *at Telxpress* The pages and articles where this term does real work: what we advise, build and support. - Page ### [AI Agents & Business Automation](https://telxpress.com/solutions/ai/) AI voice, sales and support agents plus CRM and workflow automation, deployed and supported by our team. Based in Irvine, CA. - Page ### [AI Consulting & Strategy for Businesses](https://telxpress.com/ai-advisory/) Practical AI roadmaps, tool selection and deployment from advisors who also build it. Book a free AI readiness assessment. - Page ### [Donya AI Voice Agent: Never Miss a Call](https://telxpress.com/solutions/ai/voice-agent/) Donya answers every call 24/7, qualifies leads and books appointments. Call the demo line to hear it. Built and run by Telxpress. 04 Sources ## Public *references* The standard or law this definition rests on, as published by its owner. Fetched and checked on the review date above. - [Lewis et al., Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks (arXiv)](https://arxiv.org/abs/2005.11401) arxiv.org Next step ## Want This Applied *to Your Business?* Book a free 30-minute AI readiness consultation. You'll leave with three AI opportunities specific to your business, whether you work with us or not. [Book My Free Consultation](https://telxpress.com/book/) [Take the Free AI Readiness Assessment](https://telxpress.com/ai-readiness/) [Or call 24/7: (949) 861-4500](tel:+19498614500) Last reviewed: October 11, 2026. Published by Telxpress, Irvine, CA.