Guglielmo Marconi
The first milestone of radios was when Guglielmo Marconi successfully transmitted the first radio signal, marking the beginning of wireless communication. This invention laid the foundation for future radio technologies.

AM Radio
The second milestone was the rise of Amplitude Modulation (AM) radio in the 1920s. This lead to the establishment of commercial broadcasting. This era made radio a popular medium for entertainment and information.

FM Radio
The third milestone was the rise of Frequency Modulation (FM) radio. It offered offered better sound quality and reduced static compared to AM. FM became the standard for music broadcasting, especially from the 1950s onward.