The iCloud Photos service is heavily integrated into the Photos app on Macs and Apple mobile gear. With iCloud Photos active, every photo you take is automatically uploaded to your iCloud account and synced with other Apple devices signed in to your Apple ID. You can thus enjoy your photos and videos on all your Apple tech, regardless of which device they were taken on.
Features such as Memories, People and edits you’ve made are synced between your Apple devices. Edit a photo on your