How are short stories, medium-length novels, and full-length novels categorized?

Short stories, medium-length novels, and full-length novels were usually divided based on the length of the story. Generally speaking, short stories usually do not exceed 2000 words, medium-length stories exceed 2000 words but do not exceed 5000 words, and long novels exceed 5000 words. However, this length division was only a rough division. In fact, the length of the story might vary according to the theme, style, plot, and other factors. In addition to the length of the story, there were other criteria such as the narrative, theme, and character creation. However, these standards were only for reference. The specific division still had to be judged according to the work itself.