What is a letter?
In the literary Russian language of the 18th century, the word �letter� itself expressed a general meaning: an essay, a work. And under the great influence of the Polish-language vocabulary into the Russian language in the 18th century, perhaps �letter� as a word meant not only litterae (writing, letters), but also opus (work).
What is the letter really?
A letter is a postal item in the form of a written message, possibly with another attachment, which is intended for the exchange of various information between people. Initially, the letter was presented in the form of a text message, which is written on paper or on a similar carrier, for example, on a sheet of parchment, a piece of birch bark or a clay shard in the form of sign speech recording systems. This makes it possible to transmit various information over long distances.
Nowadays, the letter has retained its main function and carries in itself, first of all, the informational purpose.