Also known as: data provider, data supplier
A business that collects user data from a range of sources and sells it to online advertising companies, such as Data-management platform (DMP)s and Demand-side platform (DSP)s.
Data brokers collect the data directly (e.g. via tags on a web page) and purchase it from companies, like credit card companies, for example.
Advertisers then use this data to improve targeting during online media buys.