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

https://seo.edu.rs/blog/active-vs-passive-digital-footprints-understanding-how-youre-being-tracked-11056

Every time you visit a website or use an app, you leave behind a trail of data that companies use to track your habits. This is your digital footprint. It’s how advertisers follow you around the internet