What is business letter?

A commercial business letter is a letter written in formal language, usually used when writing from one business organization to another, or for correspondence between such organizations and their customers, clients and other external parties. The overall style of letter will depend on the relationship between the parties concerned.

http://en.wikipedia.org/wiki/Business_letter

A formal letter written to someone to give or get information, or to discuss a problem.

www.scribendi.com/advice/glossary.en.html

Business letters are formal letters used for business-to-business, business-to-client, or client-to-business correspondence. There are a number of elements to a business letter.

http://www.ehow.com/facts_5024015_business-letters-definition.html

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