AI Glossary
What is prompt engineering?
Prompt engineering: Prompt engineering is the craft of writing instructions that get reliably good output from an AI model — by specifying role, context, format and constraints.
In plain English
"Review my code" gets you generic comments. "Review this code as a senior engineer; rank findings by severity; skip style nits; end with the one change you'd insist on before merging" gets you a real review. Same model — the difference is the prompt. The constraints do the work: they close off the lazy, generic answer.
Why it matters
- The cheapest way to get dramatically better AI output — no new tools needed
- A structured prompt (role → context → format → constraint) is repeatable across tasks
- Most "the AI is useless" experiences are prompt problems
A concrete example
PromptAI's prompt library has 50 tested examples of this craft — copy one and compare it against a one-line request.
Related terms
Learning AI from scratch? Start with the free Learn AI course picks, then put it to work with 50 tested prompts — or get the daily 2-minute briefing, free →