The document discusses several theories about how audiences interact with and are influenced by media. It begins by describing the hypodermic needle model from the 1920s, which proposed that audiences passively receive information from media without questioning or processing it, and are easily manipulated. It then discusses criticisms of this model and the two-step flow theory proposed in the 1940s that information spreads from media to opinion leaders to less active associates. Later theories discussed include uses and gratifications theory, which suggests audiences actively use media to fulfill certain needs, and reception theory, which considers how meaning is encoded in media texts and decoded by audiences.