A radio drama (or audio drama, audio play, radio play, radio theater or audio theater) is a dramatized, purely acoustic performance, broadcast on radio or published on audio media. With no visual component, radio drama depends entirely on dialogue, music and sound effects to help the listener imagine the characters and story. Radio drama achieved widespread popularity within a decade of its initial development in the 1920s. By the 1940s, it was a leading international popular entertainment. With the advent of television in the 1950s, however, radio dramas lost their popularity, and in some countries have never regained large audiences.
Some nations still have thriving traditions of radio plays. In the United Kingdom, for example, the British Broadcasting Corporation (BBC) produces and broadcasts hundreds of new radio plays each year on Radio 3, Radio 4 and Radio 4 Extra.
Several of Ian Fleming's James Bond novels have been adapted into radio dramas since the mid-1950s. For the voice actors' pages, see here.