IOS 8

iOS 8 is the eighth version of iOS, which was released on 17 September 2014. It was first announced at WWDC 2014 on 2 June 2014.

Continuity
Continuity has been added, which allows for cross-device communication features. Two of which include:


 * Handoff, which lets users start a task on one device and continue on another.
 * Phone call functionality for the iPad and Mac.

Notifications

 * Notifications can now be interacted with by swiping down on it.
 * The Today view in Notification Center can now be customized with Widgets.
 * The "Missed" view in Notification Center has been removed.

Keyboard

 * QuickType has been added, which displays word predictions.
 * Third-party keyboards can now be applied.

Family Sharing
Family Sharing has been added, which allows for purchases to be shared across different Apple IDs.

App Switcher
The App Switcher will now display contacts above the app cards. Tapping on one will provide messaging and calling links.

Camera and Photos

 * The Time-Lapse video mode has been added to more devices.
 * Panoramic photos can now be taken on the iPad.
 * Self-timers can now be set in the Camera app.
 * Advanced editing features have been added to the Photos app.
 * iCloud Photo Library has been added to the Photos app, which allows for photo synchronization between different devices.
 * Search in the Photos app has been enhanced.

Messages

 * Do Not Disturb has been added for group conversations.
 * Voice messages can now be sent.

Music

 * The Music app in iOS 8.4 includes the new Apple Music streaming service.
 * With the launch of Apple Music, the iTunes Radio service would be removed.

Passbook
The Passbook app now includes the Apple Pay services, which was added to the iPhone 6 series in iOS 8.1.

iCloud Drive
The iCloud Drive app has been added, which lets user browse their files stored in iCloud. The app can be enabled in the Settings app.

Safari

 * The Password Sharing feature has been added.
 * Safari now supports the WebGL graphics API.

App Store

 * The "Explore" tab has been added for providing improved app discovery.
 * The "Search" tab will now display trending searches.
 * App pages now support videos.

Apple Watch
iOS 8.2 would add support for the Apple Watch.

Health
The Health app has been added, which can be used for tracking fitness and body data from third-party apps.

Weather
Weather app data is now provided by The Weather Channel, rather than Yahoo.

Siri
Shazam integration has been added to Siri. Recognized songs will be listed in the iTunes Store app.

Phone
Wi-Fi calling is now available for phone calls.

Tips
The Tips app has been added, which displays information about iOS features on a weekly basis.

List of known builds
The first developer beta of iOS 8 was released on 2 June 2014, and the GM build was released on 9 September 2014.