Project Loon is a Google initiative to provide internet access to rural and remote areas using balloons floating in the stratosphere. The balloons travel approximately 20 km above the Earth's surface, carried by winds in the stratosphere. Special antennas on the balloons connect to each other and to antennas on the ground, allowing people to access the internet. Project Loon began testing in 2013 and has expanded tests to locations like New Zealand, California, and Brazil to refine the technology.