Literal and figurative language is a distinction within some fields of language analysis, in particular stylistics, rhetoric, and semantics.
Literal usage confers meaning to words, in the sense of the meaning they have by themselves, outside any figure of speech. It maintains a consistent meaning regardless of the context, with the intended meaning corresponding exactly to the meaning of the individual words. Figurative use of language is the use of words or phrases that implies a non-literal meaning which does make sense or that could [also] be true.
Aristotle and later the Roman Quintilian were among the early analysts of rhetoric who expounded on the differences between literal and figurative language.
In 1769, Frances Brooke's novel The History of Emily Montague was used in the earliest Oxford English Dictionary citation for the figurative sense of literally; the sentence from the novel used was, "He is a fortunate man to be introduced to such a party of fine women at his arrival; it is literally to feed among the lilies." This citation was also used in the OED's 2011 revision.
Within literary analysis, such terms are still used; but within the fields of cognition and linguistics, the basis for identifying such a distinction is no longer used.
Figurative language can take multiple forms, such as simile or metaphor.Merriam-Webster's Encyclopedia Of Literature says that figurative language can be classified in five categories: resemblance or relationship, emphasis or understatement, figures of sound, verbal games, and errors.
A simile is a comparison of two things, indicated by some connective, usually "like", "as", "than", or a verb such as "resembles" to show how they are similar.
A metaphor is a figure of speech in which two "essentially unlike things" are shown to have a type of resemblance or create a new image. The similarities between the objects being compared may be implied rather than directly stated.
An extended metaphor is metaphor that is continued over multiple sentences.