Apple MacBook Air (11-inch, Early 2014) - Manual (Page 9)

Be up to date across all your devices
iCloud lets you access your music, photos, calendars, contacts, documents,
and more from your Mac, iOS devices, and even your PC. It keeps everything
up to date automatically.
Create a Pages document, take a photo, or buy a song with one device, and
it’s instantly available on all the others. With iCloud Drive, you can store your
files in iCloud and organize them any way you like. Family Sharing makes it
easy to share family members’ iTunes Store, App Store, and iBooks Store
purchases. iCloud helps you locate and protect your Mac if you misplace it.
To choose the iCloud features you want, click System Preferences in the Dock
and click iCloud.