What is the difference between aside and soliloquy

A soliloquy is a long speech spoken by a single character that is not intended to be heard by any other character in the play. An aside is not spoken to the other characters on stage, which makes it more like a soliloquy than a monologue. But unlike a soliloquy, an aside is typically very short.

Explanation:

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it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.