Mid-roll ads are advertisements that appear in the middle of a video or audio content. They are strategically placed to capture the audience's attention when engagement is typically high. These ads can vary in length and format, often ranging from a few seconds to a couple of minutes. These ads are commonly used in platforms like YouTube and podcasts, allowing creators to monetize their content effectively. By inserting ads during the content, advertisers can reach viewers who are already invested in the material, potentially leading to higher conversion rates and better audience retention.