Final answer:
An advertisement revolves around a single idea and is a form of communication used to promote a product, service, or idea.
Step-by-step explanation:
An advertisement has ads that revolve around a single idea. It is a form of communication used to promote a product, service, or idea. Advertisements can take various forms, such as commercials, posters, flyers, or online banners. They are designed to capture the attention of the target audience and persuade them to take a specific action, such as making a purchase or supporting a cause.