How It Works • Transmission: A transmitter converts audio or data into an electrical signal and combines it with a carrier wave sent out via an antenna. • Reception: A receiver uses tuned circuits to capture these waves, separate the signal, and play it back through a speaker. • Modulation: Signals travel primarily through AM (amplitude modulation) or FM (frequency modulation) bands. History and Impact • Invention: Theorized by James Clerk Maxwell and proved by Heinrich Hertz, the system was developed into practical wireless communication by Guglielmo Marconi in the late 1890s. • Evolution: Once the dominant source of home entertainment with dramatic series and live variety shows, radio shifted largely to music, talk formats, and local news after the rise of television. • Role Today: A