Books can belong to groups. 
Books belong to many groups. 

Books belong to different groups. These groups are called genres. 

Genres can have smaller groups inside them. These are called subgenres. For example, a novel is a large genre. A detective novel is a smaller group inside it. You can even have a "hard-boiled" detective story. That is a tiny group inside the detective group.
Long ago, a man named Aristotle studied these groups. He looked at poetry and speech. He saw types like comedy and tragedy. Later, people in the Romantic period had new ideas. They felt some books should be unique. They wanted to escape from real life. In 1957, a scholar named Northrop Frye made a new system. He grouped stories by how heroes act. He also looked at who the stories were for. Some were meant to be sung. Others were meant to be read or acted.
Have you ever wondered how we sort all the books in a library? 

Genres work by moving from big groups to small ones. A large group is called a genre. Inside that group, you can find smaller groups called subgenres. Think about the genre of the novel. A detective novel is a subgenre of the novel. You can even find a "hard-boiled" detective novel inside that group. 
People have been studying these groups for a very long time. The idea began with a thinker named Aristotle. He used ideas from biology to sort literary kinds. He called these kinds "species." 
Many different people added to these ideas over the years. In the late eighteenth and early nineteenth centuries, the Romantic movement changed things. People then felt that every book should be unique. They wanted to escape from wars and hard times in the real world. 
Today, we still use these categories to enjoy our favorite stories. We can find poetry with short forms like haiku or sonnets. We can find prose in notebooks, novellas, or short stories. 
A literary genre is a specific category used to group works of literature. These categories help organize writing based on shared conventions. Authors and readers use these groups to understand the style, mood, and content of a text. Genres are often determined by literary technique or the length of the work. For example, fiction can be categorized by its prose structure. Genres can also be defined by their tone or specific organizational features. This system allows for a wide range of expression across poetry and prose. 
The mechanism of genre works through a process of hierarchical classification. It generally moves from very broad, abstract classes to more specific, concrete distinctions. A large category is known as a genre, which can then be divided into subgenres. For instance, the novel is a major genre of narrative fiction. Within that category, the detective novel exists as a subgenre. One can even find a "hard-boiled" detective novel as a subgenre of the detective novel. This nesting allows for immense detail and variety in storytelling.
Literary works can be divided into several distinct types and stages. Western literature is often subdivided into three classic forms: poetry, drama, and prose. Poetry can be further split into lyric, epic, and dramatic forms. Lyric poetry includes many short forms, such as the sonnet, ode, ballad, and elegy. Dramatic poetry includes genres like tragedy, comedy, and melodrama. Even comedy has its own sub-categories, such as satirical comedy or comedy of manners. Some works, called semi-fiction, even mix elements of both fiction and nonfiction.
The history of genre began with the Greek philosopher Aristotle. He applied biological concepts to literature by calling genres "species" or *eidē*. In his treatises *Rhetoric* and *Poetics*, he organized literary material into specific groups. In *Rhetoric*, he proposed three types of oratorical genres based on purpose. These included deliberative, which argues for future policy, and forensic, which discusses past actions. He also identified epideictic oratory, used to offer praise or blame during ceremonies. In *Poetics*, he divided poetry into the epic, tragedy, and comedy.
Following Aristotle, the study of genre continued to evolve through different eras. The first-century Greek treatise *On the Sublime* discussed how writers influence audience emotions. During the late eighteenth and early nineteenth centuries, the Romantic movement changed genre theory significantly. Many thinkers at this time viewed traditional genre definitions as "primitive and childish." They believed each work could be a genre unto itself. This shift occurred during a time of wars and social upheaval in the West. People often sought "escapism" through the new "imaginative" genre to avoid their difficult realities.
In 1957, the Canadian scholar Northrop Frye provided a new system in *Anatomy of Criticism*. He used methodological classifications to describe the constraints of various genres. He categorized myth, legend, irony, and the tragic by the relation between the hero and the laws of nature. Frye also used the juxtaposition of the "real" and the "ideal" to group works. In his view, romance represents the ideal, while irony represents the real. Comedy serves as a transition from the real to the ideal. Tragedy represents the transition from the ideal back to the real.
Modern genre theory in the twenty-first century has changed how we view these labels. For a long time, genre was sometimes seen as a loss of individuality. Modern scholars have worked to remove these negative connotations of conformity. Today, genres are seen as flexible tools rather than strict rules. While some distinctions remain widely accepted, they are often subject to debate. For example, the genre of fiction is usually applied only to prose texts like novels. It does not typically include fables, which are a different type of literature. 
Beyond traditional genres, there are other ways to categorize all literature. Some systems use age categories, such as children's, young adult, or adult literature. Others use format to classify works based on their physical or structural design. This includes categories like graphic novels, picture books, and radio plays. Whether through genre, age, or format, these systems help organize the vast world of human expression. They allow us to navigate the complex connections between different styles of storytelling.
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