ELI5: Explain Like I'm 5

Photonics mast

A photonics mast is like a very tall, thin tower with special technology inside. It is often used to help send and receive messages, pictures and data from satellites, airplanes, and other things far away. The mast is often very tall because the signals it sends and receives need to travel across long distances. Inside the mast is a lot of special technology that helps the signals be sent and received very quickly and accurately.