This document discusses the concept of a digital tattoo, which refers to the tracking of a person's online activities and digital footprint over time. It provides examples of some of the tools that can be used to track digital footprints, such as search engines, social networks, and other websites. The document also shares some of the author's own digital history, including early personal websites and blogs, to demonstrate how a digital footprint accumulates online over many years through various online activities and accounts.