Fill in the blank:The ads on search engines are usually made up of________.

Search engine ads, particularly those displayed on Search Engine Results Pages (SERPs), are predominantly text-based. These ads, often called "text ads," consist of headlines, descriptions, and display URLs, designed to be concise and informative. While some search engines may integrate visual elements like product images for shopping ads, the core format for standard search advertising remains text. Audio and video are generally not used for these ads as they would disrupt the user's search experience and are more common in other digital advertising formats like display or social media ads.