Sound film refers to movies that include synchronized sound, particularly dialogue, music, and sound effects. This innovation transformed the film industry in the late 1920s, moving away from silent films that relied solely on visual storytelling and intertitles. The first successful sound film was The Jazz Singer, released in 1927, which featured both spoken dialogue and musical performances. The introduction of sound in films required new technology and techniques, leading to the development of microphones, sound recording, and editing methods. As a result, sound films enhanced the audience's experience, allowing for more complex narratives and emotional depth, ultimately shaping modern cinema.