Copywriting is writing whose job is to move someone towards an action: buying, signing up, donating, booking or reading on. It covers headlines, straplines, product descriptions, landing pages, adverts, fundraising appeals, email subject lines and the buttons at the end of them. What sets it apart from other writing is that it’s judged by what readers do next, as well as by whether they understood.
Good copywriting starts before the words. It needs a clear audience, an offer worth having and evidence for the claims, then language that makes the case quickly and credibly. Adjectives can’t rescue a weak proposition: a charity appeal that names one specific thing a gift pays for gives readers more to act on than three paragraphs about passion and commitment.
The trade grew up in print advertising, and some of its habits have lasted. Claude Hopkins argued in Scientific Advertising (1923) that adverts should be tested and judged by results rather than taste. David Ogilvy’s account of his own process in the 1950s – research first, agree the problem with the client, write many headlines, edit repeatedly – reads much like a good brief today.
Why it matters for content
Copy often sits at the point where someone decides. A headline determines whether a page gets read, a call to action whether a form gets started, a subject line whether an email gets opened. Small changes at those points can shift outcomes, so copy repays testing and revisiting rather than being written once and left.
Persuasion carries responsibility. Copy that hides conditions, invents urgency, shames people for declining (“No thanks, I don’t like saving money”) or buries the real cost can lift a number for a week and erode trust for much longer. These tactics are well documented as deceptive patterns, and in the UK advertising rules require objective claims to be backed by evidence and material information to be shown clearly. Content designers working alongside marketing teams often end up being the ones who ask whether a promise is one the service can keep.
How AI changes the picture
Copy is one of the first places organisations put generative AI to work, because the outputs are short, plentiful and easy to compare. A model can produce fifty headline variants in seconds, which echoes the old discipline of writing many and choosing one. The bottleneck moves to choosing: knowing which option fits the audience, the brand voice and the facts, and which only sounds like advertising.
Models trained on vast amounts of marketing drift towards its most common moves – superlatives, urgency, “unlock” and “elevate” – and will add a claim nobody approved if it makes the line flow. Give the model the approved facts, offers and limits as inputs, and check every claim in the output against them. A model’s prediction of which variant will win doesn’t replace running the test with real people in the real context.
Questions people ask
- How is copywriting different from content writing?
Copywriting usually aims at a specific action in a short space. Content writing more often explains or informs over a longer stretch, building trust that may lead to action later. The line blurs on product pages and in email, where both jobs happen at once.
- Does every piece of copy need a call to action?
Only when there’s a next step the reader wants. A confirmation email after a purchase can reassure without asking for anything else, and adding “Shop more” at that moment can feel grasping.
- Is clever copy effective?
It can be, when the reader gets the point straight away. Wit that delays understanding is charging the audience admission.
- Should copy be long or short?
As long as the decision needs. A free newsletter sign-up might need a single line; a course costing thousands needs answers to every question a careful buyer will ask. Long copy works when each paragraph earns its place and fails when it repeats itself.
Learn more
- David Ogilvy’s Copywriting Process – a 1955 letter, reproduced on Chase Reeves’s blog, in which Ogilvy describes studying earlier campaigns, agreeing the problem with the client, writing a long list of headlines and editing each draft several times.
- Misleading advertising – advice from the UK’s advertising rule-makers on where persuasion crosses the line, with rulings on unsupported claims, missing information and exaggeration, and when obvious puffery is allowed.
- Deceptive Patterns – a long-running catalogue of design and copy tricks in apps, websites and AI systems that steer people into choices against their interests.