Information about monsters:
A monster is any creature, usually found in legends or horror fiction, that is often hideous and may produce fear or physical harm by its appearance and/or its actions. The word "monster" derives from Latin monstrum, an aberrant occurrence, usually biological, that was taken as a sign that something was wrong within the natural order.
The word usually connotes something wrong or evil; a monster is generally morally objectionable, physically or psychologically hideous, and/or a freak of nature.
The root of "monstrum" is "monere", which does not only mean to warn, but also to instruct, and forms the basis of the modern English demonstrate. Thus, the monster is also a sign or instruction. This benign interpretation was proposed by Saint Augustine, who did not see the monster as inherently evil, but as part of the natural design of the world, a kind-of deliberate category error.
Monsters have been regarded by primitive peoples as of supernatural origin. Human monsters have been attributed to intercourse between women and the devil or between men and animals. Many mythical beings such as races of dwarfs and giants, cyclops with a single eye, sirens, mermaids, races of men with a single median leg — were probably suggested by actual observations of human monsters. The scientific study of monsters began with William Harvey (1651) who attributed them to deviations from the normal course of embryonic development. The present system of classification of monsters was introduced by Isidore Geoffroy Saint-Hilaire whose great work on anomalies (Paris, 1832-1837) remains a valuable source of information.
Monsters are a staple of fantasy fiction, horror fiction or science fiction (where the monsters are often extraterrestrial in nature).
There is also a burgeoning subgenre of erotic fiction involving monsters, monster erotica.
Monsters are commonly encountered in fantasy or role-playing games and video games as enemies for players to fight against. They may include aliens, legendary creatures, extra-dimensional entities or mutated versions of regular animals.
Especially in role-playing games, "monster" is a catch-all term for hostile characters that are fought by the player. Sentient fictional races are usually not referred to as monsters. At other times, the term can carry a neutral connotation, such as in the Pokémon franchise, where it is used to refer to fictional creatures that resemble real-world animals. Characters in games may refer to all animals as "monsters".