What's your favourite thing.....about iOS?

Welcome to my own little social experiment.

I want to know what all the Android-fanboys over in this forum think is the best, most-redeeming feature about iOS. The one feature that could, potentially, switch your allegiance. (I'm not saying that by posting something you want to switch to iOS, just the feature that COULD change you.) You should also know that I'm posting a vice-versa post on the Apple Core forum.

Note: You are allowed to talk about hardware. If you love the iPhone but not iOS, that's allowed.

That's it. What's your favourite thing about iOS?