Worked example 1
Is a spam filter an example of AI?
- It learns from millions of examples of spam and normal email.
- It then predicts whether a new email is spam.
- That is machine learning.
Answer: Yes — it is machine learning, a type of AI.
AI Literacy · Beginner
What is AI? A plain-English introduction
Artificial intelligence (AI) is a broad name for computer systems that do tasks we usually link to human thinking, such as recognising speech, translating or writing text.
- 1Learn it
- 2See it worked
- 3Try it online
- 4Print it
- 5Check your answer
Before you start
Who it's for and what to know first
None.
Learn it
How it works
- Most modern AI uses machine learning: instead of being given every rule, the system learns patterns from huge amounts of example data.
- A chatbot like ChatGPT, Gemini or Claude is built on a large language model (LLM). It has learned patterns in text and predicts likely next words to produce an answer.
- Because it predicts plausible text, an LLM can sound confident while being wrong. It does not ‘know’ facts the way a reference book does.
- AI is good at drafting, summarising, explaining in different ways and brainstorming. It is weaker at up-to-date facts, precise maths without tools, and anything needing real-world judgement.
- AI is already in everyday tools: spam filters, map routes, photo search, voice assistants and recommendations.
Try it online · print it · check it
Practice questions
Tips
Common mistakes
- Assuming AI understands like a person.
- Assuming anything a chatbot says is up to date.
Last reviewed: 25 September 2026