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iCloud Private Relay security
iCloud Private Relay helps protect users primarily when browsing the web with Safari, but it also includes all DNS name resolution requests. This helps ensure that no single party, not even Apple, can correlate the user’s IP address and their browsing activity. It does this by using different proxies, an ingress proxy, managed by Apple and an egress proxy, managed by a content provider. To use iCloud Private Relay, the user must have iOS 15, iPadOS 15, macOS 12.0.1, visionOS 1.0, or later, and be signed in to their iCloud+ account with their Apple Account. iCloud Private Relay can then be turned on in Settings > iCloud or System Settings > iCloud.
For more information, see iCloud Private Relay Overview.