# What is Hallucination?

Source: https://mushbloom.uk/resources/glossary/what-is-hallucination.html

By Mushbloom. Published and updated: 2026-10-12.

## Definition & overview

A hallucination is an AI-generated statement that is unsupported or incorrect but may sound plausible. It can include invented facts, sources or quotations, even when the answer is confidently written.

## Analogy & mental model

An assistant fills a gap in a report with a convincing guess instead of saying they do not know.

Verify factual claims and source links before sending advice or publishing client content.

## Why it matters

Confident mistakes can damage customer trust and create operational or legal exposure. Hallucinations are not limited to obscure questions: models can invent prices, dates or source links. Systems need a safe way to admit that information is missing.

## Practical business example

An assistant drafts an email with a discount that does not exist. Validation blocks the message and asks a staff member to confirm the offer.

Illustrative scenario, not a client case study or promised result.

## How it works

1. Identify claims that need verifiable factual support.

2. Compare those claims and citations with approved sources or trusted records.

3. Reject unsupported assertions or obtain human review before consequential use.

## Core components

- Factual claim

- Available evidence

- Verification or abstention

Retrieval and better prompts reduce some risks but do not eliminate hallucinations.

## Hallucination vs Ordinary uncertainty

Uncertainty can be honestly reported. A hallucination presents unsupported material as though it were factual; confident wording does not remove that difference.

## Frequently asked questions

What does Hallucination mean?
A hallucination is an AI-generated statement that is unsupported or incorrect but may sound plausible. It can include invented facts, sources or quotations, even when the answer is confidently written.

How is it different from Ordinary uncertainty?
Uncertainty can be honestly reported. A hallucination presents unsupported material as though it were factual; confident wording does not remove that difference.

What is a sensible first step for a small business?
Verify factual claims and source links before sending advice or publishing client content. Identify claims that need verifiable factual support.

What limitations should I keep in mind?
Retrieval and better prompts reduce some risks but do not eliminate hallucinations.

## Sources

Google: Creating helpful, reliable content: https://developers.google.com/search/docs/fundamentals/creating-helpful-content

No rankings, AI citations or commercial outcomes are guaranteed.