What is a usual name for electromagnetic waves that travel through space?

Electromagnetic waves that travel through space are commonly referred to as radio waves. This terminology is established in the field of communications and radio technology. Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum that are longer than infrared light. They can propagate through a vacuum, such as outer space, allowing them to carry signals over vast distances without requiring a medium, which distinguishes them from other types of waves like sound or pressure waves that depend on a physical medium to travel.

Radio waves play a crucial role in ham radio operations, as they are used to transmit information over long distances by modulating the waves with audio signals or digital data. This characteristic makes them fundamental for amateur radio communications.