Digital advertising is constantly evolving and transforming, but the phasing out of third-party cookies represents a key turning point in its history. We are entering a new chapter of connecting with audiences, where activities will be based on the use of first-party data that companies obtain directly from their audiences on their websites or mobile apps. This marks the beginning of a new era in the buying of advertising space in digital media, which will require a deeper understanding and effective use of this valuable information for more targeted and personalised advertising.