Is a service business that helps client businesses sell goods and services by producing and placing advertisements.

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Account ( o Key Account) = manager of an AD who is responsible for the campaign of the most important customers.
Creative Director = manager of an AD who to develop various marketing schemes and strategies for a client
Copywriter = manager of an AD who has responsibility for the advertisement's verbal or textual content. The copywriter is responsible for telling the story, crafting it in such a way that it can produce an emotional response
Art director = manager of an AD who typically works in tandem with a copywriter. The team usually works together to devise an overall concept (also known as the "creative" or "big idea") for the ad. The copywriter is responsible for the textual content, the art director for the visual aspects.