There's so many good things packed into iOS 9 (the newest operating system for iPhones and iPads). There's a great article on MacRumors if you want an in-depth look at iOS 9 features, but I thought I'd share my very favorite iOS 9 feature.
The "Previous App" Button
It's very simple, but here's how it works:
When an app redirects you to another app, you are given an option in the upper lefthand corner to return to the previous app. Below is a screenshot example of a link in Drafts (on the left) that will take me to the Apple.com website (on the right). You can see that in Safari, there's a "Back to Drafts" button that replaces the "AT&T" section of the screen.
In addition to this, there's even an occasional app that will give an option to move FORWARD to the next logical location. If you click a link that leads to the Amazon App, for example, Apple not only has a "Back To Drafts" button, but they also add a matching "amazon.com" button in the top right corner as you can see in the pictures below.
This is a fairly simple feature, but it is by far my favorite. I like other iOS 9 upgrades such as Siri App Suggestions, and the revamped search bar, but this is the feature that would make it dreadful to return to iOS 8. It makes navigating between apps so much faster and easier, which is what makes the iPhone great in general, the apps.
I hope you found this useful and maybe even encouraging you to update if you haven't already. Pretty much all the bugs are worked out as they have already had a couple updates to the software so you can rest assured most apps are now fully functional on the new operating system.
I'd love to hear if you have a favorite feature on the new iOS, so feel free to write about it in the comments below! And I'll be continuing my normal app reviews/tips next week, so stay tuned for that.