* Length and Complexity: It is a long, detailed story with a complex plot, multiple characters, and a developed setting. This distinguishes it from shorter forms of fiction like short stories or novellas.
* Prose Narrative: It is written in prose, the typical form of novels.
* Focus on Individual Experience: The story centers around the protagonist's personal journey, exploring his thoughts, feelings, and experiences. This focus on individual psychology is characteristic of novels.
* Exploration of Themes: "Robinson Crusoe" tackles themes of survival, human nature, religion, colonialism, and societal structures. These complex themes are explored through the narrative, making it a rich and thought-provoking work.
* Genre-Defining: It's considered one of the earliest examples of the "Robinsonades" genre, which focuses on stories about castaways and their experiences. This influence on subsequent literature further solidifies its place as a novel.
While "Robinson Crusoe" was originally published as a travel narrative, its literary qualities, its length, and its exploration of deeper themes place it firmly within the category of the novel. It's a landmark work that paved the way for future novels and remains an important part of literary history.