How to differentiate between novels, novellas, and short stories

The difference between a novel, a novella, and a short story was the length of the story and the complexity of the content. A long novel usually had a complicated plot, many characters, various scenes, and climaxes. It needed enough words to express it. A long novel usually took a long time to write and needed to be repeatedly scrutinized and polished in order to better express the plot and character image. Novellas usually have a relatively simple plot, fewer characters, and a relatively simple plot, but the text is longer. The writing time of a novella was also shorter than that of a long novel, but the author needed to refine and summarize the plot and characters to better express the theme and emotions within the limited length of the text. Short stories usually had simple plots, fewer characters, and fewer scenes. The writing time of short stories was relatively short, but the author needed to grasp the core of the story in a short time and express the plot and theme with refined words. Therefore, the main difference between novels, novellas, and short stories lies in the complexity of the story and the length of the text. The complexity and depth of the content are not necessarily the only factors that determine the type of work.