It is the stylistic device which also has the function of intensifying one certain property of the object described. Deliberate overstatement or exaggeration of feature is essential for object.
Example 42: The earth was made for Dombey and Son to trade in and the sun and the moon were made to give them light. (Dickens)
As many SD hyperbole may lose its quality as a stylistic device through frequent repetition and become a unit of the language.
Litotes is a varied specific form of understatement. It consists of the use of the negative for the contrary. Litotes and understatement reflect either the author’s general tone of writing or a way of rendering subtle irony.