<human>:  What is the difference between a novella and a novel?
<bot>: The main difference between a novella and a novel is the length. A novella is typically shorter than a novel, with a word count between 17,500 and 40,000 words, compared to novels which have a length of more than 40,000 words. Novellas also generally focus on one particular incident or theme, while novels can contain multiple characters, subplots, and longer story arcs.