A description that appeals to the senses (what is seen, heard, smelled, tasted, or touched) and makes the reader perceive the scene, not only understand it.
In Don Quixote
as everything our adventurer thought, saw, or imagined seemed to him made and done in the manner of what he had read, as soon as he saw the inn it presented itself to him as a castle, with its four towers and spires of gleaming silver, with its drawbridge and deep moat, and with all the appurtenances such castles are painted with.
The "four towers and spires of gleaming silver," with "drawbridge and deep moat," set a whole castle before the reader's eyes, so vivid that the contrast with the inn appears only when the scene refutes it.
Part One: The Gentleman and the Windmills, the narrator, on the gentleman's arrival at the inn