Developers will have to reveal how data is shared with any third-party partners, which include analytics tools, advertising networks, third-party SDKs or other external vendors. They ll also have to report whether their apps track users, which permissions they request, and if the data is anonymized or linked to the user. The detailed information will be turned into privacy labels for apps so that users can easily see how their data is being handled.
Source: https://threatpost.com/apple-privacy-labels-apps-data-sharing/161081/