Letters may be divided into the following classes:
(a) Private or Personal letters are those that relate to personal matters concerning the writer and the addressee (ব্যক্তিগত চিঠি — সাধারণতঃ আত্মীয়-স্বজন ও বন্ধুবান্ধবদের নিকট লিখা চিঠি).
(b) Business or Commercial letters are those that are written to or by businessmen for business purposes (ব্যবসায়-সংক্রান্ত চিঠি ).
(c) Official letters are those that are written to or by persons in their official capacity (সরকারী বা বেসরকারী অফিস-সংক্রান্ত চিঠি). They may be strictly official or demiofficial.
(d) Social letters are those that are written to invite persons to some ceremonial function, private or public (সামাজিক অনুষ্ঠানে নিমন্ত্রণের চিঠি).
(e) Letters to the Press are those that are written by members of the public to the editors of newspapers on matters of public interest (সংবাদপত্রে প্রকাশের জন্য চিঠি).
