Parts of a Business Letter. Business Letter is a letter which is used by organizations to communicate in a professional way with customers, other companies, clients, shareholders, investors, etc. Business letter uses formal language and a specific format.
Remember, you're hoping the person who receives your letter has no memory of your closing at all. The last thing you want is a hiring manager going into an HR meeting with your cover letter in hand, asking the team if they want to meet with "Mr. Kindest Personal Regards."