https://www.cnet.com/roadshow/news/gm-buys-lidar-developer-strobe-to-further-self-driving-car-tech/

General Motors on Monday announced its acquisition of Strobe, a sensor-tech firm that works on lidar. Strobe's engineering team will join the self-driving wizards at Cruise Automation, another firm that GM acquired in its efforts to build a mass-produced self-driving car.

Lidar is a surveying method that uses light to measure the distance to a target. It's similar to radar, which uses radio waves instead of light. Lidar units are capable of creating high-resolution maps, which self-driving vehicles can use to assess their surroundings in detail. Many automakers believe lidar is a key component of the tech required to bring autonomous vehicles to the road.