The consideration of style has two purposes:
(1) An evaluation of the sum of the choices an author makes in blending diction, syntax, figurative language, and other literary devices. Some authors' styles are so idiosyncratic that we can quickly recognize works by the same author.
We can analyze and describe an author's personal style and make judgments on how appropriate it is to the author's purpose. Styles can be called flowery, explicit, succinct, rambling, bombastic, commonplace, incisive, laconic, etc.
(2) Classification of authors to a group and comparison of an author to similar authors. By means of such classification and comparison, we can see how an author's style reflects and helps to define a historical period, such as the Renaissance or the Victorian period, or a literary movement, such as the romantic, transcendental, or realist movement.