A Hertzian wave, also known as a radio wave, is a type of electromagnetic wave that can travel through space. Named after the physicist Heinrich Hertz, these waves are used in various forms of communication, including radio, television, and mobile phones. They have wavelengths ranging from a few millimeters to several kilometers. Hertzian waves are generated by oscillating electric charges, which create changing electric and magnetic fields. These waves can propagate through different mediums, including air and vacuum, making them essential for wireless technology. Their ability to carry information over long distances is fundamental to modern telecommunications.