Ads.txt, short for Authorized Digital Sellers, is a simple and secure method for publishers to declare which companies are authorized to sell their digital ad inventory. This text file, located on a publisher’s website, lists the names of authorized sellers and their corresponding IDs, allowing buyers to verify the legitimacy of the ad space they are purchasing. By implementing Ads.txt, publishers can protect their brand and revenue by preventing unauthorized reselling and ad fraud. This industry-wide initiative promotes transparency and trust between publishers, buyers, and ad networks, ultimately creating a safer and more efficient digital advertising ecosystem.