The document discusses the different styles used for writing business letters, including full block, modified block, semi block, indented, simplified, and hanging indented styles. It provides definitions and examples of each style. The full block style justifies all text to the left margin. The modified block style indents some elements slightly to the right of center. The semi block style aligns the date line at the center and indents paragraphs. The indented style indents all new paragraphs. The simplified style is used when the recipient's name is unknown and features a capitalized subject. The hanging indented style indents all lines after the first in each paragraph.