The Concept of "Digital Shadow": Between Active Trail and Passive Fingerprint Definition and Differentiation of Concepts The "digital shadow" (digital shadow) is the aggregate of all digital data, directly or indirectly related to a person, which they did not create intentionally and do not control directly. This is a key distinction from the "digital footprint" (digital footprint), which includes both passive data and active — consciously left by the user actions (social media posts, comments, sent messages). The digital shadow is formed beyond our will: this includes surveillance data, bank and store transactions, metadata of calls and movements, logging actions on websites, information from "smart" devices, and so on. In essence, it is a hidden digital profile that often reflects our habits and preferences more accurately than the consciously constructed online identity. Interesting fact: According to a World Bank study, in 2025, the volume of data generated in the world per day reaches 463 exabytes. Up to 80% of these data will be unstructured information, including those very passive digital shadows. For comparison: all the information stored in the world in 2008 was about 500 exabytes. Shadow Architecture: What Forms It? The digital shadow consists of several interrelated layers: Administrative and financial layer: Data from state registers, tax history, credit ratings, purchase history (especially by bank cards), insurance data. Behavioral layer: Logs of website and app visits (cookies, search history), movement routes (GPS data from smartphones, taxi ride history), metadata of communications (who, when, to whom called, call duration). Sensory layer: Data from IoT devices — "smart" energy meters, fitness trackers, home assistants, smart home systems, which record daily routines, eating habits, sleep patterns. External assessment layer: Reviews, mentions, tags on photos made by others, credit scoring system decisions, assigned ratings (for example, drivers in ... Read more