Discovery ads are a type of online advertising format that uses machine learning algorithms to automatically create and display ads to users based on the content of the websites or apps they are currently viewing. Discovery ads often appear in places like the Google Discover feed, YouTube home page, or Gmail promotions tab, and are designed to be visually appealing and engaging to users. Discovery ads are typically more effective at driving brand awareness and interest, as opposed to direct response, and are often used in the early stages of the customer journey. Discovery ads are often used by advertisers to reach a broad audience, and can be targeted based on factors such as user location, interests, and demographics.