The advertising coverage rate refers to the percentage of a target audience that is reached by a particular advertising campaign. It measures the effectiveness of an advertisement in terms of its ability to reach and engage with potential customers. A high advertising coverage rate indicates that the ad has successfully captured the attention of a large portion of the intended audience, while a low rate suggests that the ad may have missed the mark. This metric is often used by marketers to evaluate the success of their advertising efforts and make informed decisions about future campaigns.