In what is widely regarded as his greatest presentation ever, Apple's Steve Jobs introduced the iPhone to the world on January 9th, 2007. In the five-plus years since then, the iPhone, iPad, and iPod Touch have literally redefined the entire world of mobile computing. That world is moving so quickly that iOS is already amongst the older mobile operating systems in active development today. That certainly doesn't mean it's underpowered or underfeatured — quite the contrary. Through what can only be described as relentless and consistent improvement over the years, Apple has made iOS one of the most feature-rich and well-supported platforms on the market.

iOS 7, the system currently powering Apple's mobile devices, offers an easy-to-understand smartphone operating system to new users, a powerful platform for app developers, and a relatively un-fragmented experience across multiple devices. Perhaps the most remarkable thing about iOS is how similar the OS as it exists today is to the OS as it existed 2007, yet the number and breadth of features that Apple has baked in since then is mind boggling. Far from suffering from the "feature creep" that typically bogs down operating systems over time, iOS has managed to stay relatively snappy and is more internally consistent than anything else available today. And iOS 8 — launching on devices this fall — looks to evolve the story even further.

How did we get from a platform that began without third-party apps, multitasking, or even copy / paste support to where we are today? Read on to see exactly how Apple evolved its mobile platform over the years, in our history of iOS.