Apple added the iCloud Shared Photo Library in iOS 16, iPadOS 16, and macOS Ventura, dramatically improving sharing photos and videos with a group of people with whom you frequently exchange media. Shared Library, as it appears in the Photos app, is a kind of supercharged shared album that you might use with your family or a close friends group.
However, it is usually the case we want to be circumspect about what we share: every picture we take is not one we want even a select group to see. Because of how the Shared Library is integrated into the iOS/iPadOS Camera app, it can be easy to drop a private photo into the group pool.
Read more at Macworld.com