How to Build, Visualize, and Activate Custom Audiences in Audience Explorer. Audience Explorer is used to build, visualize, and activate customizable audiences using behavioral and telco datasets. The workflow starts by selecting the geographic market where the target audience resides, then confirming the market and defining target audience criteria. In the App Ownership tab, users can target audiences based on the specific apps installed on their devices. Users can also filter for active versus inactive users within specific app categories, which helps identify lapsed or loyal audiences for a brand or its competitors. Pre-built personas are available: Ownership Personas bundle related behaviors into segments, and Engagement Personas are also available. The demo selects the 'Luxury Living App Users - Heavy' audience and reviews its geographic distribution and insights. The audience can be visualized nationally and drilled down into a specific region such as California to see local index variations. Data updates for the selected region, including audience insights and reach. Zoom and index toggle features show the highest indexing areas for the target audience and allow overlay of custom targeting catchment areas. The Personas sub-tab adds demographic context with Experian Mosaic segments, which provide socio-economic information about the local audience. Shopper Affinity uses Mastercard aggregated and anonymised spend insights to show what the audience buys and highlight high-propensity spending habits. Telco Insights uses T-Mobile data to show carrier-level engagement patterns. The inventory forecasting tool provides estimated addressable reach to forecast scale across CTV, DOOH, Video, and Display for the custom audience, supporting omnichannel activation planning. Custom-built audiences can be saved and shared with a team or a Blis sales representative.