soliloquy
In drama, where a character speaks to themselves, representing their inner thoughts or feelings and in the process relaying them to the audience (but not to other characters.)
monologue
In drama, where a character speaks their thoughts out loud to share them with the audience and any other characters present.
aside
In drama, where a character shares a comment only with the audience for humorous or dramatic effect. This is usually a feeling, thought, or piece of additional background information.