Answer: The difference between monologue and dialogue is that a monologue is a speech given by a single individual and a dialogue is a conversation between at least two people.
Explanation: A monologue is a long speech pronounced by only one character of a story. Monologues are generally used in plays, films and tv shows. Moreover, most times they are included to show a character's thoughts and feelings to the audience. In contrast, a dialogue is a conversation that involves more than one character. Furthermore, they are also used in plays and in television.