What is the difference between dialogue and monologue?

Question

Dialogue is conversation between two or more characters. In a monologue, one character speaks alone.
Dialogue is conversation between only two characters. In a monologue, one character speaks alone.
Monologue is conversation between two characters. Dialogue is conversation between three or more characters.
Dialogue is conversation between two or more characters. Monologues appear only in novels.

Answer 1

Have you tried a dictionary?

Answer 2

A monologue is a speech given by a character to express his thoughts and feeling to the audience or other characters while a dialogue is a conversation between two or more characters. A monologue involves only one character and is less common than the dialogue which involves at least two characters.