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BONN, GERMANY - DECEMBER 09:  A quadcopter drone arrives with a small delivery at Deutsche Post headquarters on December 9, 2013 in Bonn, Germany. Deutsche Post is testing deliveries of medicine from a pharmacy in Bonn in an examination into the viability of using drones for deliveries of small packages over short distances. U.S. online retailer Amazon has also started its intention to explore the possibilities of using drones for deliveries.  (Photo by Andreas Rentz/Getty Images)
BONN, GERMANY - DECEMBER 09:  A quadcopter drone arrives with a small delivery at Deutsche Post headquarters on December 9, 2013 in Bonn, Germany. Deutsche Post is testing deliveries of medicine from a pharmacy in Bonn in an examination into the viability of using drones for deliveries of small packages over short distances. U.S. online retailer Amazon has also started its intention to explore the possibilities of using drones for deliveries.  (Photo by Andreas Rentz/Getty Images)

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The rise of drones

It's taken only a few years for drones to explode on to the scene. CNN's Kristie Lu Stout explains why the key driver of this revolution in flying machines is your smartphone.

The rise of drones

It's taken only a few years for drones to explode on to the scene. CNN's Kristie Lu Stout explains why the key driver of this revolution in flying machines is your smartphone.