Most of the 4 trillion images in Google Photos are never viewed. To help people look back through their gigabytes of pictures, Google Photos is expanding its Memories slideshows tool and updating Cinematic Photos to animate more “3D images” from the past. Interestingly, Google Photos is also adding features to help hide Memories or tuck photos behind a private vault.
Source: Google Photos Adds Tons of Memory-Building (And Memory-Hiding) Features – Review Geek