hi

[narmada]

what are the types or letters?
what is formal letters?
what is communication?types of communication?

[Anglika]

Welcome to the forums.

Communication is the exchange of information and the way in which this exchange takes place. You can communicate by speech, writing, gesture, code, music.

As to letters: start here: http://www.usingenglish.com/resource...r-writing.html