The history of a person's usage of digital devices, which includes, among others, TV movies and programs watched, Web pages downloaded, websites logged into, text, chat and social media messages sent, links clicked and Facebook pages liked. Also called a "digital fingerprint," this information is widely used to target ads to consumers. In addition, credit card transactions and cellphone calls also create a digital footprint that can be used to track a person's whereabouts. See also
footprint and
memory footprint.