Which type of sound involves speech by two or more onscreen actors?

Dialogue involves the speech of two or more onscreen actors, facilitating communication and interaction between characters within a scene. It is a crucial element in storytelling, as it helps convey emotions, plot points, and character relationships. Dialogue can significantly contribute to viewer engagement by allowing audiences to connect with the characters through their spoken words.

In contrast, sound effects refer to audio elements that are added to enhance the visual experience but do not involve human speech. Ambient sound comprises the background noise present in a scene, which helps to create a sense of realism but also does not include dialogue. Voice-over typically involves narration or commentary spoken by a character but is not performed in direct interaction or as part of the onscreen action with other characters. Hence, dialogue is distinct in its direct representation of communication between characters.