"Business Correspondence is the communication or exchange of information in a written format for the process of business activities. Business correspondence can take place between organizations, within organizations, or between the customers and the organization. The correspondence is generally of widely accepted formats that are followed universally." (Merriam-Webster's Guide to Business Correspondence. Springfield, Mass.: Merriam-Webster. 1993.)
Source: collin.edu
The Business Student's Phrase Book by 
