Broad purpose of this article is to analysis different types of Business Letters. Business letters can be quite a letter from one company to another, or between such businesses and their customers, clients as well as other external parties. The overall design of letter depends on the connection between the parties concerned. A business letter is sometimes useful since it produces a permanent written record, and may be studied more seriously by the recipient than other designs of communication. Here briefly discuss some types of Business Letters, like: Letters of Transmission, Letters that Inform, Requests and Responses to Requests, Letters of Offer and Acceptance, Sales Letters and Condolence Letters.