Your digital footprint is basically the trail of breadcrumbs you leave behind...

https://reidwxzz567.image-perth.org/what-are-website-trackers-and-what-are-they-actually-doing-with-your-data

Your digital footprint is basically the trail of breadcrumbs you leave behind whenever you browse, shop, or use apps. Advertisers use these pieces of your history to build a profile and target you across the web