Literature was an art form that used words to express the author's thoughts, emotions, and ideas. It can be divided into many different types such as realism literature, romanticism literature, science fiction literature, magical realism literature, mystery novels, horror novels, martial arts novels, etc. To be specific, literature could be categorized according to different standards. A common classification method was to classify literature by genre or style, such as realism literature, romanticism literature, modernist literature, post-modern literature, and so on. In addition, literature could also be categorized according to the subject or content, such as romance novels, historical novels, science fiction novels, novels, detective novels, and so on. Literature was an important art form that could not only help people understand the world better, but also enrich people's thoughts and imagination.