AI at WorkWhat is an AI chatbot? A plain explanation for work
An AI chatbot is a program that writes text one piece at a time, based on patterns it learned from a very large amount of writing. That one sentence explains most of its strengths and its mistakes.
How it works, without the mathematics
A chatbot such as ChatGPT, Claude, Gemini or Copilot is built on a "large language model". During training, the model reads a huge amount of text and learns which words tend to follow which. When you type a question, it does not look up an answer in a database. It writes a reply by choosing, again and again, the next piece of text that fits what came before. Because it learned from a great deal of human writing, the result is often fluent, useful and correct. Because it is choosing what fits, not checking what is true, it can also be fluent, convincing and wrong.
What it does well
- Drafting and rewriting. First drafts of letters, emails, notices and posts; changing the tone; making a text shorter or simpler.
- Explaining. A clause, a formula, a concept, in simple words, at the level you ask for.
- Summarising and sorting. Turning a long text or a messy list into points or a table.
- Brainstorming. Ten possible subject lines, names or lesson ideas to choose from.
- Helping with code and spreadsheets. Formulas, small scripts, and explaining an error.
- Translating between languages, with quality that varies by language and topic.
What it does badly
- Facts that must be exact. Section numbers, dates, rates, names, quotations, citations, prices. It may produce a precise-looking answer that does not exist.
- Recent events, unless the tool searches the web and shows you its sources.
- Arithmetic and long calculations, unless it runs code. Check numbers yourself.
- Knowing your situation. It does not know your client, your school, your shop or your local rules unless you tell it, and then you must be careful what you tell it.
- Admitting that it does not know. It often answers anyway.
The consequence: you are the editor
Treat the output as a draft from a fast, eager assistant that has read a lot and sometimes invents. You decide what to ask, you remove private data before you ask, and you check the facts before you use the answer. The pages on this site about prompts, checking answers and privacy turn that into habits.
Chatbot, search engine, or both?
A search engine finds existing pages and shows you where they are. A chatbot writes something new. Some tools combine them: they search the web and write an answer with links. Use the links. If a tool gives no sources for a factual claim, find one yourself before you rely on it.
Free and paid
Most of these tools have a free version and paid plans. Paid plans usually give more use, newer features or more powerful models; the details change often. The page on free and paid plans explains how to decide without being sold to.
Does the chatbot learn from me while we talk?
Within one conversation it uses what you wrote earlier. Whether your conversations are also used later to improve the company's models depends on the tool and your settings. See the privacy pages.
Is it the same as Google Search?
No. Search finds pages. A chatbot writes a new reply.
This is an independent guide. It is not connected with OpenAI, Anthropic, Google, Microsoft or any other AI company; product names belong to their owners. Statements about companies are taken from their own help pages as read on 13 and 14 November 2026. The prompts are our own wording and were not run against every tool. Not legal, financial or professional advice.