Which factor has the most direct influence on the Click Through Rate (CTR) of an ad on DuckDuckGo?

The factor that has the most direct influence on the Click Through Rate (CTR) of an ad on DuckDuckGo is the relevance of the ad to the user's search query. Since DuckDuckGo primarily uses contextual advertising, the ad's alignment with the user's immediate search intent is critical. A highly relevant ad is more likely to capture the user's attention and encourage them to click. For example, an ad for 'organic dog food' will have a higher CTR if it appears in response to a search for 'best organic dog food brands' compared to a more general search like 'pet supplies'. While ad copy, bidding strategy, and ad placement also play a role, relevance is the foundation for a successful ad campaign on DuckDuckGo.