IAB format, also known as Interactive Advertising Bureau format, refers to a set of standardized specifications for online advertising created by the Interactive Advertising Bureau (IAB). These formats are used by advertisers, publishers, and ad tech companies to ensure consistency and compatibility across different platforms and devices. The IAB format includes various ad sizes, such as banners, skyscrapers, and rectangles, as well as rich media and video ads. By adhering to the IAB format, advertisers can effectively reach their target audience and publishers can seamlessly integrate ads into their content, resulting in a more engaging and user-friendly online experience.