In iOS 8 Apple added the ability for apps to refresh in the background, but iOS 9 adds proper multitasking - the ability to run two apps, and interact with them both at the same time, in split-screen. (This only works on the iPad Air 2 and iPad Pro.)
What is Multi-touch?
The iPhone and iPad display enables touch screen interaction using more than one finger (digit) at a time.
A good example of this can be seen in the iOS game Eliss Infinity, in which you have to move planets around the screen at great speed. You will generally be moving at least two or three planets at any one time, and the game can handle up to five fingers at the same time.
What is News?
News is one of the features added to iPhones and iPads with the iOS 9 update. It's a sort of digest of news stories culled from a pre-selected list of providers. Apple describes News as "beautiful content from the world's greatest sources, personalised for you".
What is Newsstand?
Program used to download and read digital versions of newspapers and magazines. It's one of the stock apps that are pre-installed in iOS, and you can't delete it from an iPhone or iPad unless you jailbreak. But at least you can hide it in a folder if you're not interested; in iOS 6 you couldn't even do that.
What is NFC?
NFC, or near-field communication, is a technology that enables devices to pass information across a very short distance. Typically just a couple of centimeters. Although it's called near field, the general idea is to allow devices to tap each other to exchange information.
One frequently talked-up use for NFC is to allow phones to act as payment devices, much like the latest generation of tap-to-pay credit cards. Android smartphones have offered this for some time, but Apple only joined the NFC party relatively recently, with its own NFC-reliant touch-payment system, Apple Pay.
What is Notification Centre?
Feature in iOS and Mac OS X that enables you to view recent messages and alerts on the device. On an iPhone or iPad, you access Notification Centre by swiping downwards with a finger from the top of the screen.
What is Objective C?
Programming language created by Apple and used to develop Mac OS X and iOS software.
Apple user's dictionary of tech jargon: P-R
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