My smartphone is my most personal electronic. It's the first and last screen I see each day. I give it a look a couple hundred times in between. I don't think much of my smartphone, though. And while I could confidently tell you what makes this phone "smart," I would be wondering in the back of my mind if what I know is wrong.

On this week's What's Tech?, The Verge's Executive Editor Dieter Bohn explains smartphones. The iPhone and Android have made smartphones ubiquitous. But when did cell phones become smartphones? And what makes them so smart anyway?

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