Welcome to Photos
The Photos app works seamlessly with iCloud Photo Library to keep all your photos and videos stored in iCloud and up-to-date on the web, iPhone, iPad, iPod touch, and Mac.
To use Photos, go to iCloud Settings on your iOS device, tap on Photos, and turn on iCloud Photo Library. On a Mac, open Photos, go to Preferences, and turn on iCloud Photo Library.
*iCloud Photos requires iOS 8.1 or later, or OS X Yosemite 10.10.3 or later.