# What is an AI hallucination? > AI term of the day: hallucination. Source: https://learn.ynteractive.com/content/visual/term-hallucination · Updated 2026-10-17 · Free from Stepthrough (https://learn.ynteractive.com) [AI term explained](https://learn.ynteractive.com/content/visual#format-term-of-the-day) · 4 slides · [ChatGPT](https://learn.ynteractive.com/content/tool/chatgpt) By [Robert Breen](https://learn.ynteractive.com/content/about) · Published October 17, 2026 · From the free lesson [Reply Faster: Turn a Messy Customer Email Thread into a Clear, Friendly Reply](https://learn.ynteractive.com/content/chatgpt-reply-to-customer-emails) AI term of the day: hallucination. Swipe or scroll sideways for all 4 slides. The whole guide is written out below. ## The guide in text ****Hallucination**:** When an AI states something false or unsupported as if it were fact. It sounds just as confident as the true parts. ## "The cake will be completely nut-free." The bakery's first AI draft said it. The kitchen also bakes with nuts. A promise check flagged the line before it was sent. ## Judge a claim by its facts, not its tone - Number your facts before you ask for a draft. - Ask for a table: every promise and the fact behind it. - Fix anything with no fact behind it, then read it once more yourself. **The full definition:** [What is an AI hallucination?](https://learn.ynteractive.com/content/glossary/hallucination) in the AI glossary, with an example from a free lesson, common confusions and tips. Businesses and people in the examples are made up. The steps, screens and wording come from the free lesson and the Stepthrough glossary and prompt library. ## Do it yourself, free **Reply Faster: Turn a Messy Customer Email Thread into a Clear, Friendly Reply**. Turn a messy customer email thread into a clear, friendly reply: give ChatGPT the thread and your facts, check every promise, fix the tone, and send it from Gmail. You do every step yourself in a practice copy of ChatGPT, it checks your work as you go, and “Do it for me” finishes any step you get stuck on. Free, and nothing touches your real accounts. [Start the free lesson](https://learn.ynteractive.com/modules/chatgpt-reply-faster) [Or read the full step-by-step guide](https://learn.ynteractive.com/content/chatgpt-reply-to-customer-emails) ## Related terms Plain-English definitions, each with an example from a free lesson. [Hallucination](https://learn.ynteractive.com/content/glossary/hallucination) · [Deferred revenue](https://learn.ynteractive.com/content/glossary/deferred-revenue) · [Email thread](https://learn.ynteractive.com/content/glossary/email-thread) · [Net Promoter Score (NPS)](https://learn.ynteractive.com/content/glossary/net-promoter-score) · [Scope creep](https://learn.ynteractive.com/content/glossary/scope-creep) · [Self-check prompt](https://learn.ynteractive.com/content/glossary/self-verification) · [Service recovery](https://learn.ynteractive.com/content/glossary/service-recovery) · [Source of truth](https://learn.ynteractive.com/content/glossary/source-of-truth) [The full AI glossary](https://learn.ynteractive.com/content/glossary) ## Related prompts - [Check reply promises prompt](https://learn.ynteractive.com/content/prompts/check-reply-promises-prompt): A ChatGPT prompt that checks a draft before you send it: a table of every promise, the fact behind each, and safer wording for… - [Email newsletter prompt](https://learn.ynteractive.com/content/prompts/email-newsletter-prompt): A ChatGPT prompt for a short customer newsletter built from your numbered updates: one section each, one main call to action, no… - [Email shortener prompt](https://learn.ynteractive.com/content/prompts/email-shortener-prompt): Cut a long email down to what the reader needs without changing a fact, date, price or promise, plus a list of what was removed… - [Payment received thank-you prompt](https://learn.ynteractive.com/content/prompts/payment-received-thank-you-prompt): Confirm a payment and say thanks in a few lines: the amount, what it was for, the balance now owed, and what happens next… [All free prompt templates](https://learn.ynteractive.com/content/prompts) ## From the blog - [Why ChatGPT Adds Asterisks When You Paste (and the Fix)](https://learn.ynteractive.com/content/blog/chatgpt-asterisks-when-pasting): Asterisks and pound signs in pasted ChatGPT text are Markdown formatting. Why it happens and four fixes, from one prompt line to plain-text paste. - [How to Respond to an Angry Customer Email](https://learn.ynteractive.com/content/blog/reply-to-angry-customer-email): How to respond to an angry customer email: read the whole thread, list what they asked, give ChatGPT only facts you can keep, and answer every question. - [Legal Information vs Legal Advice in AI Client Emails](https://learn.ynteractive.com/content/blog/legal-information-vs-legal-advice): Legal information explains facts and process; legal advice tells a client what to do. How law firm staff keep ChatGPT drafts on the right side. ## More visual guides - [Don't tell ChatGPT to make it better. Say this instead.](https://learn.ynteractive.com/content/visual/dont-say-make-it-better): A customer's cake order went sideways. Wrong pickup day, a flavor change, and a nut allergy question nobody answered. - [5 Steps to Turn a Messy Email Thread into a Clear Reply](https://learn.ynteractive.com/content/visual/5-steps-reply-to-a-messy-customer-thread): A visual guide: paste a customer thread with numbered facts, check every promise in ChatGPT's draft, fix it and send it from Gmail. - [Mistake to Avoid: A Soft Yes When You Mean No](https://learn.ynteractive.com/content/visual/mistake-a-soft-yes-in-a-no): A visual tip for customer emails: AI drafts blur a no into "we'll do our best." Say no early, give one reason and a real alternative. [All visual guides](https://learn.ynteractive.com/content/visual) · [All free tutorials](https://learn.ynteractive.com/content)