Every time you visit a website or use an app, you leave behind a trail of data...

https://www.pfdbookmark.win/every-time-you-browse-you-leave-a-trail-of-data-behind-that-tells-companies

Every time you visit a website or use an app, you leave behind a trail of data that companies use to build a profile on you. It’s basically a digital breadcrumb trail of your habits