After search (and the massive ad business attached to it), what do you think Google's most important product is? There are multiple potential candidates like Chrome and Maps, but my money's on Android. The 10th major version of Google's mobile operating service just arrived a few weeks ago, as it now does every fall. And tomorrow, September 23rd, is the 11th anniversary of Android's official release alongside the announcement of the HTC Dream, the first phone running Android.

As just about anyone reading this site knows, Android was Google's vision for the modern smartphone, released a little over a year after Apple stormed the industry with the iPhone. Through more than a decade, both operating systems have changed radically -- but in typical Google fashion, Android felt at launch more like a beta test than anything that was truly consumer ready. "While there's plenty to praise in this phone," we wrote in our review way back in October of 2008, "there's a lot more that's missing -- and some of those missing elements are what we consider to be core components of a device in the G1's class."

But Android also did a lot well, right out of the gate. From the start, logging in with your Google account synced to your phone all the important information you might need. It took Apple years to come up with a system that seamless -- iOS 5 finally ushered in computer-free sign-in and setup in the fall of 2011. If you used Google Calendar, Contacts and Gmail, it would all be right there, no hassle required. Of course, in the case of contacts, that wasn't necessarily a good thing, because Gmail's contact system was an absolute mess that took years to unravel. Such was life in those early days of the smartphone revolution.

Another place Android shone from day one was notifications. We may take the pull-down notification shade for granted now, but Android had it from day one. It was a far better solution than what you'd find on Windows Mobile, BlackBerry or the iPhone, and Apple decided to essentially copy it outright in 2011. Microsoft also put its own take on the Android notification shade into Windows Phone, but it was too little too late for that platform by then.

It would be another year before Android really became friendly to more than just Google enthusiasts, though. 2009 saw the simultaneous release of Android 2.0 and the Motorola DROID on Verizon, the biggest carrier in the US. (Disclosure: Verizon became Engadget's parent company in 2015.) The hardware was a huge step forward from the G1, while software updates like support for multiple email accounts, an improved browser, a revamped contact system and a host of UI improvements all made Android easier and more pleasant to use.