Novels are books which have one long story written in them. They are works of prose fiction. They are longer than short stories. 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.
The first novels were written more than three hundred years ago. Some people say that Don Quixote by Miguel de Cervantes is the first novel. It was first published in 1605.