- Bio-data- Biographical data.
- CV- Curriculum Vitae.
- Business Letter- Most essential means of communication in the business world.
- Demi-official letter- A letter that communicates official correspondence along with personal news is called demi-official letter or demi-government letter.
- Informal Letter- Mainly used for personal communication, non-serious in nature and casual in conversation.
- Formal Letter- A letter with set defined rules and regulation. These letters have impersonal tone and formal content; specially written for formal communication such as communication at office, organizations, companies, etc.