This document discusses digital footprints and how technology collects information about individuals. It defines a digital footprint as the trail of data left behind by a person's interactions online and through various technologies. Examples discussed include information collected from social media use, mobile phones, credit cards, location services, and other devices. The document also notes scenarios where digital footprints are collected through technologies like mobile phones, wireless networks, cable TV systems, ATMs, and traffic cameras. It addresses concerns about how much personal data is out there and how it is used, and provides some tips for minimizing privacy risks online.