Novels are books which have one long story written in them. They are works of prose fiction. They are longer than short stories and novellas. There are many kinds. For example, some are adventure stories, like "Treasure Island" by Robert Louis Stevenson. There are horror (scary) stories like Mary Shelley's "Frankenstein". There are also science fiction novels like "Dune" by Frank Herbert, and humorous novels like "Tom Sawyer" by Mark Twain. Novels in English are usually at least 60,000 words long. Some are much bigger, 150,000 words or more. Novels usually have 100 pages or more.