The Privacy Sandbox Proposals on Android
Topics are recognizable categories that are inferred based on the apps you use. Apps and advertising platforms can use them to decide what ads may be relevant to you. Topics are selected entirely on your device, so the information about the apps you use isn’t shared with external parties. You will be able to see and control your topics in your device settings.
FLEDGE introduces a new way to show ads based on "custom audiences" defined by app developers and the previous interactions within their app. This information and associated ads are stored locally, so that no individual identifiers are shared with external parties. This enables remarketing for businesses to their existing customer base in a privacy-safe way.
Today, marketers rely on cross-app or device identifiers, such as Advertising ID, to be able to evaluate the effectiveness of their advertising. The Attribution Reporting APIs aim to replace the current methods of measurement with solutions that don’t rely on user-level tracking mechanisms, so that people’s information is better protected.
The SDK (Software Development Kit) Runtime will provide an isolated process for third-party advertising code to run separately from an app’s code. This will limit the app and user data that third-party advertising providers have access to, providing greater security and privacy protection for users.