Apple has released the OS X Yosemite 10.10.3 update, and among its features is the new Photos app that has been available to developers since February. Photos replaces Aperture and iPhoto, and is designed to work better with the company's mobile products. Photos brings an interface nearly identical to what's in iOS 8, offering basic editing tools and easy sharing.
With the new Photos app, users are able to browse their photographs by both location and time within Collections, Years, and Moments, as well as navigate through the photo library through different tabs: Projects, Shared, Albums, and Photos. One-click photo optimization is available, which improves a photograph's quality with a single click, and simplified editing tools are also available. Under the surface are more complex editing tools, though many features from Aperture did not make the trip. Photos can import Aperture and iPhoto libraries, after which changes in one app will not be available in the other.
Integration with iCloud is improved in Photos. Photographers can store images in the iCloud Photo Library at full resolution and in their original format, and can access the content on the iCloud.com website, as well as on any Apple device, including iPhones and iPads. 
Mac OS X 10.10.3 is available to users as a free update in the Mac App Store; it is about 1.5GB in total. With the update also comes several bug fixes bug fixes and changes to usability.