A narrative, story, or tale is any account of a series of related events or experiences, whether non-fictional or fictional. Narratives can be presented through a sequence of written or spoken words, through still or moving images, or through any combination of these. The word derives from the Latin verb narrare, which is derived from the adjective gnarus. The formal and literary process of constructing a narrative—narration—is one of the four traditional rhetorical modes of discourse, along with argumentation, description, and exposition. This is a somewhat distinct usage from narration in the narrower sense of a commentary used to convey a story. Many additional narrative techniques, particularly literary ones, are used to build and enhance any given story.