Novellas are a unique form of written fiction that typically fall between short stories and full-length novels in terms of length. They often explore complex themes and character development within a more concise framework, allowing authors to create impactful narratives without the extensive detail of a novel. These works can vary in style and genre, often focusing on a single event or character's journey. Notable examples include Franz Kafka's "The Metamorphosis" and John Steinbeck's "Of Mice and Men," which showcase the depth and richness that can be achieved in a shorter format.