Customer List is a first-party list of customer or prospect identifiers uploaded to a platform for matching, suppression, or targeting.
It matters because most visitors do not convert on the first visit. Retargeting terminology helps teams create thoughtful follow-up sequences, avoid wasted impressions, and respect audience exclusions and privacy expectations.
Example
A customer list can help exclude existing customers from an acquisition campaign. Prepare the supported identifiers, remove unsuitable records and compare the uploaded count with the platform’s usable matched audience before planning reach.