Prompt
The text you give an AI to get a result: a question, an instruction, a document to work on, or all three. In chat tools every message you send is a prompt, including the pasted file and the "make it shorter." Prompt engineering is the practice of wording that text so you get what you wanted.
In plain English
A prompt is whatever you type in the box. The question, the paste, the “shorter please.” The model has nothing else to go on, so the box is the whole relationship.
In the real world
- The text field in ChatGPT or Claude.
- The “Ask AI” box inside Notion, Gmail, or Google Docs.
- The template someone on your team pastes at the top of every chat.
When to use it
Every time, and be specific. Anthropic’s guidance says to decide what a good result looks like before you start tuning the words.2
- Weak: “Write a newsletter intro.”
- Better: “Write a three-sentence intro for our monthly newsletter to small-business owners, announcing online booking. Friendly, no exclamation marks. Here’s last month’s intro for tone: …”
When not to use it
- Don’t write two pages for a one-line question.
- If you’re pasting the same instructions every day, stop. That belongs in a system prompt or a project.
Good, bad, ugly
- Good: a specific prompt gets a usable first draft.
- Bad: a vague prompt gets a generic answer, and the model takes the blame.
- Ugly: a course selling you fifty magic phrases. There are no magic phrases.
Key facts
- Counts as the prompt
- The question, the pasted text, the attached file, and the follow-up
- A good one has
- The task, who it is for, the format, and one example of good
- Next level
- Context engineering, which is deciding everything else the model sees
Common questions
What makes a good prompt?
Say what you want, who it is for, what format, and show one example. Specific beats clever every time.
Do I need to learn prompt engineering?
You need to learn to brief. Anthropic's own guidance starts with defining what success looks like before touching the prompt. The magic-phrase lists are not the skill.
Is a longer prompt better?
No. A longer prompt with the right details is better. A longer prompt with filler is worse, because it uses up the context window.
References
- Prompt engineeringWikipediaView source
- Prompt engineering overviewAnthropic, Claude Platform DocsView source