Your digital footprint is the cumulative trail of information about you that exists online. It is not one thing - it is several layers laid on top of each other, and most people have a much larger footprint than they realise.
Cleaning up your digital footprint means working systematically across all five layers - active (what you published), passive (what others published about you), owned (accounts you control), earned (third-party coverage), and aggregated (data broker profiles). The order matters: do the audit first, then remove the easy wins, then the harder ones, then build a stronger positive layer that protects what you have done.