Final answer:
The most significant difference between film and theatre is the live performance aspect of theatre.
Step-by-step explanation:
The most significant difference between film and theatre is the live performance aspect of theatre. In film, scenes are captured and edited using cameras, whereas in theatre, the performance happens in real-time in front of a live audience. While film can use various techniques like camera angles and editing to create nuance, theatre relies on the actors, music, and scenery to convey the story.