1. Introduction: Letter writing is not only undertaken for business dealings. In reality we write letters for social matters like marriages, death, giving condolence, congratulating on an achievement etc. Over and above this letters are written for religious matters also. In other words for all human activities ‘letter writing is undertaken.
2. Types of Letter Writing: There are two main types of letter writing: (1) Formal letters (2) Informal letters.
(1) Formal Letters : This letters are written with many objectives; letters written for business, administration or for government matters are called formal letters.
(2) Informal Letters : The letters written for social matters and to maintain relations are called Informal letters.

Note: (1) Business letters also include complain letters, reconciliation letters, letters written to increase sales, letters written to banks and transport company.
(2) Official letters also includes transfer, promotion, giving of specific work and special assignment etc.