A style is a set of formatting rules that apply to text, tables, and lists in a Word document. When a style is applied it can change the appearance and structure of a document quickly.
Learn to use styles! So many Word users manually adjust section by section and implement formatting the direct method instead of using styles. The author is guilty of this just as well. Advantages of styles include speed, format consistency, ability to insert a table of contents, and ease of updating. Styles are granular. They encompass these levels: paragraph, character, table, and list.