OS X Yosemite

OS X Yosemite, or OS X 10.10, is the eleventh major release of the OS X operating system released on 16 October 2014. It was announced on 2 June 2014 at WWDC. This version includes major interface overhauls, replacing the older, skeumorphic icons with newer, flat ones that resembled the designs on iOS 7. The old default font (Lucida Grande) was changed to Helvetica, until OS X El Capitan, where it was changed again to San Francisco.

New features and changes

 * The user interface has been redesigned and the skeuomorphic design that was present in previous versions was removed in favor of a flat design. The icons of various apps were updated to correspond with the icons of iOS 7. The design of the Dock was redesigned and is now a 2D translucent rectangle instead of a skeuomorphic glass shelf, which resembles the Dock in early versions of OS X. The new UI also includes thinner fonts and blurred translucency effects.
 * The Today view has been added to the Notification Center. It displays information and updates from various sources along with widgets.
 * The UI of Spotlight was redesigned and the search box is displayed at the center of the screen. It also can include search results from various online sources.
 * Continuity has been added, increasing its intergration with iOS and iCloud.
 * Handoff has been added which allows the OS to integrate with iOS devices over Bluetooth LE and Wi-Fi.
 * The Photos app has been added to replace iPhotos and Aperture.
 * Safari received various enhancements.
 * The Dark mode option was added which makes the Dock and menu bar darker.
 * The default system font has been changed to Helvetica Neue.