What is a brief remark or comment made by a character in a drama called?

A brief remark or comment made by a character in a drama is referred to as an aside. This term specifically describes a moment when a character speaks directly to the audience or to themselves without the other characters hearing, revealing thoughts or feelings that are not meant to be heard by the rest of the cast. It often provides insight into the character's motivations or plans, enhancing the audience's understanding of the narrative.

In contrast, a monologue involves a longer speech presented by a single character, usually directed towards other characters or the audience, rather than being a brief interjection. A soliloquy is a type of monologue where a character speaks their thoughts aloud while alone on stage, allowing the audience to hear their inner reflections. Dialogue refers to the conversation between two or more characters, which engages in exchanges and interactions rather than the unilateral expression present in an aside. Therefore, the term that specifically indicates a brief, often insightful comment is indeed an aside.