Today, our apps are basically self-contained castles. Walled off from every other app, you have to open Google Maps to find restaurants in your area, then you have to open up Yelp to search its reviews, and then you have to load Safari to search what Kow Soy is because everybody on Yelp says you just have to order it.
In response, Apple debuted a new feature that will appear in their new iPhone/iPad software, iOS 8. They’re called Extensions. And what they do is allow you to use apps within apps, without having to multitask your way back and forth.