In which situation would you use a business letter?

In business, you might use letters and memorandums to communicate with others. A letter contains the company's letterhead or return address, the date, the recipient's address, a subject line, salutation, message, closing and signature.

(Re-answer) You could use them in a proposition, you to talk about like why a certain companies should fund you or your idea

Hold one let me think

Bis the answer hope this