Where are the audiences I create in Audience Creator?

All the audiences you generate using your filters in Audience Creator are saved in the "My Audiences" module, which you can access from Audience Insights.

If you edit any hearings from the "Suggested Hearings" module, a copy will also be saved in "My Hearings."

What does "is a client" mean in Audience Creator?

Anyone with at least one historical purchase is considered a customer. This filter serves to separate them from people who have registered or given away data without having purchased.