iCloud Photo Library lets you access your photos and videos on multiple Mac computers, as well as your iPhone, iPad, iPod touch, and iCloud.com.
Just sign in to iCloud with the same Apple ID on all your devices. You can turn on iCloud Photo Library in Photos > Preferences, or from the iCloud pane in System Preferences.
After you sign in, these items appear in the Photos app on all of your Mac computers:
- All original photos and videos
- All folders and albums
- Smart Albums
- Names and faces in the People album
- Key photo selections
These items are available only on the Mac where you created them:
- Books, cards, and calendars
- Keyword shortcuts
- Unused keywords
- Last imported album (this album contains photos you most recently imported on a specific Mac)
Your photos or videos must be stored inside the Photos library to be accessible through iCloud Photo Library.