Should a user visit an online store, for example, the user data is sent to AdExchange (a platform for buying and selling programmatic advertising). There, the data is collated with advertiser criteria and a real-time auction takes place. These processes occur within milliseconds while the website loads. The average loading time is 2.6 seconds. An auction normally lasts between 50 and 100 milliseconds.
The highest bidder may then display their ad on the website’s advertising space. The price for placing an ad observes the second-price auction principle. In other words, the bidder pays one cent more than the second bidder.
If the advertiser indicates, for example, that they only want to place ads for women between 30 and 50 years old, and the user is 60 years old, then they will not be shown any of the advertiser’s ads (but probably another instead). However, the requirements can also be more far-reaching.
Should the user leave the online store’s website without purchasing anything and then sees an ad for this same shop the next time they visit a news site, the advertiser has provided a criterion like this for their ad: “Show the specific ad to all website visitors who leave our site without making a purchase.”