Your digital footprint is basically the permanent trail of data you leave...

https://www.a1bookmarks.win/think-of-your-digital-footprint-as-the-trail-of-breadcrumbs-you-leave-behind-1

Your digital footprint is basically the permanent trail of data you leave behind every time you use an app or browse the web. Companies use this info to build a profile on your habits and target you with ads