"Push Notification" ?

to get the any update / alert from server

Process -> 

1. Create AppId and provisioning profile for each application that uses Push Notification also SSL certificate for Server with private key at iOS provisioning portal 2. Register for getting Push Notification to APNS in AppDelegates - didFinishLaunchingWithOptions method with API registerForRemoteNotificationTypes:Types

3. APNS receives Bundle identifier, Provisioning Profile with above register API call.

4. APNS will send the token id to client and it can be received in callback didRegisterForRemoteNotificationsWithDeviceToken

5. Send this token id to your server who will be sending the Notifications to APNS and then APNS to client.

6. Now if anything new happens on server it will send the payload (JSON Dictionary) to APNS with SSL certificate and Token Id.

7. APNS server will send the notification to client as per token id now you can get this Notification in didReceiveRemoteNotification

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8. New male and female Siri voices for U.S. English and French, and a male voice for German.

9. Improved Calendar app which tells you when is the event in a month.

10. In the lock screen, when music is playing, you can toggle between the music controls and the Clock by pressing the Home button.

11. In the Messages app, when you tap on the Contact option, it displays the icons for call, FaceTime and Info. If you tap on the call button, it gives you an option for Voice call or FaceTime call.