A quotation, also called a quote, is a fragment of a human expression, most often written or oral, which has been inserted into another human expression. This latter type of quotation is almost always taken from literature, though speech transcripts, film dialogues, and song lyrics are also common and valid sources.

Besides this, a quotation can also refer to the use of a piece of other artistic works — elements of a painting, scenes from a movie or sections from a musical composition — into another one.

Source:  Wikipedia