What year did CNN first broadcast, making it a milestone in cable television?

CNN first broadcast in 1980, marking a significant milestone in cable television history as it was the first 24-hour news channel. This innovation fundamentally changed how news was consumed, allowing viewers to access real-time news updates around the clock. The establishment of CNN not only created a new format for news dissemination but also set a standard for the emergence of various other news networks that followed, emphasizing the importance of constant news coverage in the media landscape.