Monologue-Soliloquy | Commonly Confused Words

Monologue

/ˈmɒnəlɒɡ/

A long speech by one person in a play, movie, or conversation

/səˈlɪləkwi/

A speech in which a character talks to themselves, revealing their thoughts to the audience.

A monologue is delivered with other characters present, while a soliloquy is delivered when a character is alone.
Both involve a single character speaking, but in soliloquy, the character often reveals inner thoughts.
A monologue can be addressed to other characters, audience, or oneself; a soliloquy is not addressed to the audience, but rather an introspective passage.
In a play, a monologue will maintain the ongoing interaction, but a soliloquy pauses it to focus on one character's thoughts.
Soliloquies provide insight into a character's mind, whereas monologues extend dialogue or provide exposition.