Business letters can have many types of content, for example to request direct information or action from another party, to order supplies from a supplier, to point out a mistake by the letter's recipient, to reply directly to a request, to apologize for a wrong, or to convey goodwill.
A business letter is sometimes useful because it produces a permanent written record, and may be taken more seriously by the recipient than other forms of communication.
[1][2] Typically, side, top and bottom margins are 25–32 millimetres (1–1+1⁄4 in) inches, and one-page letters and memos are vertically centered.
In a modified-block format letter, all text is left aligned (except the author's address, date, and closing), paragraphs are not indented, and the author's address, date, and closing begin at the center point.
In a modified semi-block format letter, all text is left aligned (except the author's address, date, and closing), paragraphs are indented, and the author's address, date, and closing are usually indented in the same position.