written message on paper containing information sent from one party to another, during the transport usually stored inside an envelope
A letter is a written message conveyed from one person to another person through a medium. Letters can be formal and informal. Besides a means of communication and a store of information, letter writing has played a role in the reproduction of writing as an art throughout history. Letters have been sent since antiquity and are mentioned in the Iliad. Historians Herodotus and Thucydides mention and utilize letters in their writings.
Read more or edit on Wikipedia
book by Mary Wollstonecraft