As of 2015, Apple discontinued its iPhoto app, and the app is no longer available for download. An app called Photos replaced iPhoto, and Apple included it in the OS X Yosemite operating system for Mac.
IPhoto was Apple's first photo viewing interface and was featured on Macs, iPhones and iPads prior to 2014. The interface allowed users to view and edit photos on any of their Apple devices through the iCloud sharing system.
IPhoto's replacement, Photos, comes preloaded with the OS X Yosemite upgrade available for Mac. To download this upgrade ensure that the device possesses compatible hardware. The upgrade works with iMacs from mid-2007 or later, MacBook Pros from late 2008 or later, and Mac Minis from early 2009 or later. A full list of compatible devices is available on the Apple website.
To upgrade to OS X Yosemite, the device must also have a compatible operating system: OS X Snow Leopard version 10.6.8, OS X Lion version 10.7, or OS X Mountain Lion version 10.8. To find out which operating system a device has, open the "About This Mac" window, and find the OS version listed under the serial number. If the device is capable of running OS X Yosemite, download the OS from the Apple App Store, and follow the on-screen instructions for upgrading.