There are three types of data: first-party data, second-party data, and third-party data.
What is Third-Party Data?
Third-party data is any data source that you access through an intermediary. These data
aggregators collect personal data from a variety of sources, segment it based on
demographics, psychographics, and other key points, and then sell those segments
commercially. There also doesn’t have to be a paid relationship, so third-party data
also includes any sources that you receive from an intermediary, regardless of the
commercial arrangement.
Image Source: https://www.cendyn.com/library/why-you-should-be-focusing-on-first-party-data/
