Answer 3: The audience can hear a monologue, while a soliloquy is heard by the audience and other characters.
Monologue is a long speech of one person to express the content of his thinking process or thoughts as if he speaks aloud. He may talk to himself or directly to the listeners themselves. The addressees of speech, in general, are the listeners, but they may be the other characters on the stage that may not hear the speech while they too can be present and listen but do not give responses.
On the other hand, a character gives a soliloquy when he speaks his inner thoughts and feelings aloud as though to himself, particularly where such a speaker is fabulously alone on stage. A soliloquy is differentiated from a normal monologue by the fact that it is not directed to the viewers or a character but tends to uncover the reflections of the character. Other characters who are on stage might, however, hear what would be a soliloquy even if uninformed to the speaker.
Hence, the main difference between a monologue and a soliloquy is that a character addressing direct speech to other characters in a play during a monologue, only heard by the audience, whereas everyone else in a play hears this direct speech of a character in a soliloquy.
