Data sourced from an external provider such as Factori, that has been collected, aggregated, and licensed for use in analytics, targeting, and enrichment.
Third-party data is what most alt-data and enrichment providers Factori included actually sell: information collected by an entity with no direct relationship to the end consumer, then licensed onward, which is why provenance, consent basis, and licensing terms matter more here than for first-party data a brand collects itself.
Further reading: What to check before buying data · Understanding customer data
