Great graphic about how Google’s online advertising system works

https://www.wsj.com/articles/how-google-edged-out-rivals-and-built-the-worlds-dominant-ad-machine-a-visual-guide-11573142071?mod=hp_lead_pos8

Includes ally. the steps along the trail that led Google to its current pre-eminent position in the internet advertising field. Am not sure you will be able to click thru, but figured it would be worth posting the link or you to try.