This chapter discusses the evolution of radio broadcasting from its invention in the late 19th century through Marconi's popularization of wireless technology in the early 20th century. It then covers the rise of radio networks like NBC, CBS and ABC in the 1920s and the establishment of regulations like the Radio Act of 1927. The chapter also summarizes radio's Golden Age from the 1930s to 1950s when it offered genres like soap operas, comedy shows and news broadcasts before facing new competition from television. Finally, it examines radio's impact on culture through figures like Rush Limbaugh and looks at radio's future with satellite, internet/streaming radio and the rise of podcasting.