An archetype is a reference to a concept, a person or an object that has served as a prototype of its kind and is the original idea that has come to be used over and over again. Archetypes are literary devices that employ the use of a famous concept, person or object to convey a wealth of meaning. Archetypes are immediately identifiable and even though they run the risk of being overused, they are still the best examples of their kind.
Example:
Romeo and Juliet are an archetype of eternal love and a star-crossed love story.