OS X 10.10

OS X Yosemite (version 10.10) is the eleventh major release of OS X, Apple Inc's desktop and server operating system for Macintosh computers. OS X Yosemite was announced on June 2, 2013, at WWDC 2014, and was released to the public on October 16, 2014, as a free update through the Mac App Store. With this release of OS X, Apple also instituted a public beta program by sign-up, seeded in the summer of 2014.

New and Changed Features

 * Flattened 3D interface and presented a darker "night theme" and transluscent Windows 7-like elements
 * Spotlight is more tightly integrated into Application data and provides its own viewing interface -- for both local and web-based sources.
 * Today view in Notification Center - provides a single location for all of the current day's events and items
 * iCloud Drive adds Apple-branded Finder-integrated cloud storage, similar to DropBox and Google Drive.  Also has a Windows and Web-based interface
 * Safari updated, UI simplified, default search changed to Bing from Google, added Private Browsing mode and DuckDuckGo search
 * Mail handles large attachments more intuitively, allows PDF annotating, and includes Mail Drop for quick emailing of messages with attachments, where the attachments get encrypted in iCloud instead of sent via email
 * Handoff lets you start an activity on one device and pass it to another OS X 10.10 or iOS 8+ device
 * Instant Hotspot makes using your iOS 8+ iPhone for network connectivity as easy as connecting to a Wi-Fi network
 * iPhone Calls can be made from the OS X desktop
 * Xcode 6 adds new programming language designed for game app developers and multimedia data manipulation and sharing
 * Widgets