Matched content is a type of ad unit that is generated by Google AdSense. It displays related articles, videos, and other content based on the topic of a website. This helps website owners increase user engagement and keep visitors on their site for a longer time. Matched content units are fully customizable and can be placed on multiple pages of a website. They are a great way for website owners to monetize their content and provide a better user experience to their visitors by offering them relevant and interesting content.