Source: http://www.engadget.com/2013/05/15/google-conversational-search-reaches-the-desktop-through-chrome/
We're used to Google's mobile search apps letting us ask questions as we would with real people, but the desktop has usually been quite stiff. That's changing today: Google is bringing conversation-like voice search to our computers through Chrome, with no typing required. Web denizens just have to say "okay, Google," ask their question, and get back a spoken response similar to what they'd hear on their phones. The company hasn't said just how soon Chrome will incorporate the new voice features, however.