"Advertising agency" is one of the oldest labels in marketing and one of the least precise. In 2026 it describes at least four different businesses that share little beyond the word. Knowing which one you need before you start the search saves the most common agency mistake: hiring a type that is good at something you did not ask for.
What an advertising agency does, by type
The creative agency. Makes the ads: the idea, the film, the campaign line, the visual identity. Judged on whether the work is distinctive and whether people remember it. Charges by project or retainer. Usually does not buy the media or measure the sales, though it may partner with someone who does. Creative agency vs performance agency goes deeper on this type.
The media agency. Plans where the ads run and buys the space at the best rate, across TV, outdoor, programmatic, YouTube, Meta and search. Judged on reach, efficiency and delivery. Charges a percentage of spend or a planning fee. Reports impressions and cost per thousand.
The performance agency. Runs digital campaigns to a business outcome such as cost per lead or return on spend. Controls creative testing, landing pages and tracking because it cannot hit the number otherwise. Judged on cost per customer. Charges a retainer, often with a performance element. Reports enquiries and revenue. We wrote about the day-to-day of this work in what a media buyer actually does.
The full-service agency. Offers all three, plus PR, social and sometimes web development, under one contract. Convenient and expensive; the quality depends on which internal team gets your account. Full service agency vs specialists covers when the bundle is worth it.
Matching the type to your situation
If your problem is that nobody knows who you are, and you have a budget to change that over years, you want a creative agency and a media agency, or a full-service one that is strong in both.
If your problem is that you need customers at a cost you can afford, this quarter, you want a performance agency, and you should expect it to want control of creative testing, the landing page and the tracking.
If your problem is that your existing ads look amateurish but the account is working, you want a creative partner alongside your current buyer, not a replacement.
Most small and mid-sized businesses have the second problem and hire for the first, because brand work is more visible and easier to feel good about. The result is a beautiful campaign and no change in the enquiry count.
How advertising agencies charge, briefly
Project fees for creative. Percentage of spend for media buying. Monthly retainers, sometimes with a bonus tied to results, for performance. Each model carries an incentive: a percentage of spend rewards spending, a project fee rewards finishing, a retainer rewards staying. Agency fee models explained sets them side by side so you can pick the incentive you can live with.
Questions that identify the type fast
- What does your monthly report lead with?
- Will you change my landing page?
- Who makes the ads, and how many versions a month?
- What would get you fired?
- What have you turned down, and why?
Creative agencies talk about ideas and awards. Media agencies talk about rates and reach. Performance agencies talk about cost per customer and what they will not take on. The answers tell you which one you are speaking to before the proposal arrives, and how to brief an agency will help you send the right brief to the right type.
Our services page is explicit about which type we are: a performance agency that produces its own creative for testing, buys the media, and reports what a customer cost.
Questions people ask before hiring
What is the difference between an advertising agency and a marketing agency?
In practice the terms overlap. "Advertising agency" historically meant creative and media buying; "marketing agency" is broader and can include SEO, content, email and strategy. The useful distinction is by what the agency is judged on: ideas, impressions or customers.
What does a full-service advertising agency do?
Creative, media buying, digital campaigns and often PR and social under one contract. The convenience is real; the quality depends on which internal team is assigned to you, so ask who specifically will run each part.
How do advertising agencies make money?
Project fees for creative work, a percentage of spend or a planning fee for media buying, and monthly retainers, sometimes with a performance bonus, for digital performance work. Each model carries a different incentive.
Which type of agency does a small business need?
Usually a performance agency, because the problem is customers at an affordable cost rather than awareness. Brand-led creative work makes sense once the customer acquisition engine is proven and there is budget to build on it.