An attribution model is a rule or set of rules that determines how credit for sales and conversions is assigned to touchpoints in conversion path. With attribution models, you can choose how much credit each ad interaction gets for your conversion. It gives you a better understand of how your ads perform and can help you optimize across conversion journeys.
The advantage these upgrades bring to the table is the data-driven attribution model will learn more from how users interact with ads and convert. If you use this new feature along with automated bidding strategies or updates to your manual bidding, data-driven attribution will help you drive even more conversions at the CPA compared to the last click.