1.) Pesenal letter is a letter that can contact to closefriends,friends,teachers and relatives.We can ask peronal welfare,
allstory,say condolences,say congratulations and informal contact between sender and reciever .
2.)Business letter is a letter that writen for communicating company , following about business, commerce and finance.
3.)The letter of official mettle is a letter to contact other people or organizations ,to errand business and to inform concerned such as to make appointment ,to request a job application ,to check scores test,a require assistance and to require of guidance for work.
4.)Officials letter or dispatch is a letter that is written for contacting between the various government official. Writing for official letter must basd on the format .The text in the letter is the official evidence