All forms of cinema or television that involve fictional stories are forms of drama in the broader sense if their storytelling is achieved by means of actors who represent (mimesis) characters. In this broader sense, drama is a mode distinct from novels, short stories, and narrative poetry or songs. In the modern era before the birth of cinema or television, “drama” came to be used within the theatre as a generic term to describe a type of play that was neither a comedy nor a tragedy. It is this narrower sense that the film and television industries, along with film studies, adopted. “Radio drama” has been used in both senses—originally transmitted in a live performance, it has also been used to describe the more high-brow and serious end of the dramatic output of radio
The advent of radio drama, cinema, and in particular, television created greater pressure in marketing to clearly define a product as either comedy or drama. While in live theatre the difference became less and less significant, in mass media comedy and drama were clearly divided. Comedies were expected to keep a consistently light tone and not challenge the viewer by introducing more serious content.
By the early 1960s, television companies commonly presented half-hour-long “comedy” series or hour-long “dramas”. Half-hour series were mostly restricted to situation comedy (sitcoms) or family comedy and were usually aired with either a live or overdubbed laugh track. One-hour dramas included such shows as police and detective series, westerns, science fiction, and serialized prime time soap operas.