The most important AI words in English are AI, chatbot, prompt, hallucinate and deepfake. Below you’ll find 18 AI words you’ll hear in the news, at work and in everyday chat, each with a simple meaning and a real example, plus a few phrases people actually say.
AI vocabulary changes fast. A couple of years ago nobody talked about “prompts” or AI that “hallucinates”. Now you’ll hear them on the radio, in the office and down the pub.
Basics
AI (artificial intelligence)
Computer systems that can do things that usually need human thinking, like writing, translating or recognising faces.
“AI is changing how we search for information.”
chatbot
A program you can have a conversation with by typing or talking.
“I asked a chatbot to explain the joke.”
prompt
The question or instruction you give to an AI.
“Try writing a more detailed prompt.”
generative AI
AI that creates new things: text, pictures, music or video.
“The poster was made with generative AI.”
AI model
The system behind a chatbot or tool. Different companies build different models.
“The new model is faster and cheaper.”
large language model (LLM)
A type of AI trained on huge amounts of text so it can understand and write language.
“ChatGPT, Gemini and DeepSeek are all built on large language models.”
How AI works
training data
The information an AI learns from, such as books, websites and images.
“The quality of the training data really matters.”
algorithm
A set of rules or steps a computer follows to solve a problem.
“An algorithm decides which videos you see next.”
machine learning
When computers learn patterns from data instead of being given every rule.
“Spam filters use machine learning.”
voice mode
A feature that lets you talk to an AI out loud and hear it reply.
“I practise my speaking in voice mode on the bus.”
When AI goes wrong
hallucinate
When an AI confidently gives false information, as if it were true.
“Be careful, chatbots sometimes hallucinate facts and dates.”
bias
Unfair results because an AI learned from one-sided data.
“The hiring tool was dropped because of bias.”
deepfake
A fake video, photo or voice made with AI to look or sound real.
“That clip of the prime minister was a deepfake.”
AI slop
Informal: low-quality, mass-produced AI content flooding the internet.
“My feed is full of AI slop these days.”
AI in the news
AI-generated
Made by AI rather than a person.
“The band admitted the song was AI-generated.”
automation
Using machines or software to do jobs that people used to do.
“Automation is changing factory work.”
AI agent
An AI that can carry out tasks for you, like booking or searching, not just answer questions.
“An AI agent booked the whole holiday.”
regulation
Official rules controlling how something can be used.
“The EU has introduced new AI regulation.”
Everyday Phrases About AI
- “Just ask ChatGPT.” People often use one brand name for all chatbots, like saying “hoover” for any vacuum cleaner.
- “It sounds like AI wrote it.” Said about writing that feels too smooth, too long or a bit robotic.
- “Did you use AI for this?” A teacher’s favourite question.
- “The AI made it up.” When a chatbot invents something that isn’t true.
- “Is it real or AI?” Asked about suspicious photos and videos online.
Want to practise English with these tools? Read our guide: how to learn English with AI, with free options from around the world and prompts you can copy.
More tech English: computer vocabulary, computer idioms, computer science vocabulary and text slang meanings.
Frequently Asked Questions
When an AI hallucinates, it confidently gives information that is false or made up, as if it were true.
A prompt is the question or instruction you type or say to an AI tool, for example “Explain this idiom in simple English”.
A deepfake is a fake video, image or voice recording made with AI so that it looks or sounds like a real person.
AI is the general technology. A chatbot is one type of AI tool that you can have a conversation with.
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