On Monday, Google purchased Titan Aerospace, a start-up founded in 2012 that makes high-altitude, solar-powered drones. Facebook was also considering acquiring the company to help bring internet access to parts of the world that don't have it.
"Titan Aerospace and Google share a profound optimism about the potential for technology to improve the world," Google said. "It's still early days, but atmospheric satellites could help bring internet access to millions of people, and help solve other problems, including disaster relief and environmental damage like deforestation."
Here's a look at how the solar-powered drones work.