Communication through letters occupies the largest share in the total volume of communication because of the following advantages:
(1) Letters are less costly than other means of communication.
(2) Letters can be sent to long distant places by post within a short time. Of course, letters may be sent by messengers within neighbouring areas.
(3) Letters are drafted after proper thinking and planning and so the subject matter can be presented in a systematic and logical way.
(4) The ideas conveyed in letters are clear and free from ambiguity.
(5) The size of a letter may be big or small as required.
(6) Letters simultaneously provide evidence and exact copies can be retained.
(7) Same communication may-be made to a number of persons at a time, through duplicating or printing.
(8) Many unpleasant and delicate matters which cannot be spoken face to face or through mechanical devices can be written in letters in a discreet language.
(9) Letters are suitable for all types of communication.
(10) There is standardisation in form and style readily acceptable by the business world. Even internationally accepted code language is used.