A remarketing audience is a group of people who have visited a particular web page and are grouped and tracked with browser cookies. The web page publisher can then show advertisements on that browser across the web. Example: After you visit Zenni Optical, you will see advertisements for the same or similar reading glasses on different websites across the web and social media. That is because you are a part of a remarketing audience. Google, Facebook, and Pinterest are three large remarketing advertisement networks.