It shouldn't surprise you that Google's a big proponent of online security, and that's why it's rolling out support for a new way to prove you are you who are: a USB Security Key. Google's normal approach to two-step authorization involves getting a text on your phone to verify your identity, but that isn't always ideal. Maybe you suck at keeping your phone charged. Or maybe you're abroad (your author's had to deal with that particular headache a few times) and don't want to get slammed with roaming charges. Having a dedicated secure USB key around means you'll be able to log into Google's ecosystem without having to worry about phishing or having your phone handy.
Source: Google