Broadcast networks are organizations that distribute television and radio programs to a wide audience. They use antennas to transmit signals over the air, allowing viewers and listeners to access content without needing a cable subscription. Major broadcast networks include ABC, CBS, NBC, and FOX, which offer a variety of programming, including news, sports, and entertainment. These networks typically operate on a national level, reaching millions of households. They generate revenue primarily through advertising, as businesses pay to promote their products during popular shows. Broadcast networks play a crucial role in shaping public opinion and culture by providing accessible content to diverse audiences.