Hi @sanjana12
This option in filtering settings allows you to refine your target audience based on both the primary data associated with your target list (e.g., email addresses, demographics, agreements, subscriptions) and additional data points that you've collected. This means you can create more granular and precise filters to reach specific segments of your audience.
For example, if your target list contains email addresses and names, you could use additional data such as purchase history, location, or agreements to further narrow down your filters. This would enable you to send targeted campaigns to specific groups of customers based on their preferences (location) and behavior (Agreement type, subscriptions).
A more details scenarios with examples can be found here - https://experienceleague.adobe.com/en/docs/campaign-classic/using/automating-with-workflows/introduction/targeting-data