What is an ad agency?
An ad agency is the business a brand hires to make its advertising. In its classic form it does three things: it works out what to say and to whom (strategy and planning), it makes the thing that says it (creative and production), and it buys the space where people will see it (media). Some agencies still do all three. Most now specialize, and "ad agency" has become a loose label for any shop that makes paid messages, from a two-person studio turning out social ads to a network with offices in forty cities.
The term is older than most of the channels it works in. The first agencies sold newspaper space and threw the copy in for free. The copy turned out to be the valuable part, and the industry has been reorganizing around that discovery ever since.
Why it matters
Why an ad agency matters
A brand can make its own ads, and many do. What an agency brings is distance and craft: an outside eye that sees the brand the way a customer sees it, and a team that has made a hundred campaigns and knows which ideas survive contact with a thirty-second slot or a six-second skip. The distance matters more than people expect. Inside a company, every ad has to satisfy a dozen internal voices; a good agency carries one idea through that gauntlet and keeps it recognizable at the other end.
It also matters because advertising is expensive to run. Media usually costs more than production, by a wide margin, so a weak ad is a costly way to rent a good placement. The agency's job is to make the creative worth the space.
In practice
How an ad agency works in practice
- 01
It starts with a brief: what the brand needs to happen, with whom, by when and with what money. The agency answers with a strategy and a creative idea, usually presented as a world you can see rather than a list of claims. Once the idea is approved the agency produces it, in-house or through a production partner, and prepares every version each channel needs.
- 02
Then the work goes out. A media team, at the agency or at a separate media shop, places it, and the results come back as numbers: reach, views, clicks, sales. The best agencies treat those numbers as the start of the next brief rather than the end of the project.
At RIOT
Ad agencies at RIOT
RIOT is a creative agency and production studio, which is a particular kind of ad agency: the people who come up with the idea are the people who shoot it, cut it and finish it. That is how we made "For the Pursuit", a brand spot for the U.S. Chamber of Commerce, the "Real Life, Worry Free" CTV spot for Bogg Bags and, at the other end of the scale, a Meta ad engine for Homebase that ran from February to April 2025. Different budgets, same room.
Watch out
What people get wrong about ad agencies
Assuming an ad agency is a media agency. Many modern ad agencies do not buy media at all and work alongside a media partner who does; ask early which one you are hiring. The other mistake is briefing the agency on the ad instead of the problem. "We need a thirty-second spot" is an answer, not a brief, and an agency that is only given answers can only polish them.
