Jakub Porzycki/NurPhoto via Getty ImagesBeyond the touchscreen and sleek design, the defining concept of modern smartphones is apps. Unbelievably, when Apple first launched the iPhone it had no App Store.
Steve Jobs wasn't sure if he wanted to have one because of his desire to totally control the experience. Eventually, he relented. And it's a good thing he did, because Apple's App Store set the standard for how to extend smartphone functionality.