Several technical studies have been carried out to enrich the letter literature. These studies revealed the characteristics of the letters with its extending which associated with the pragmatic ends thus, these studies were prefaced by topics to discuss its implications in order to classify them according to the purpose that they came to deal with the letters were connected to its authors whom reveal their own stylistic form, but all of them meet under this literary known as "Letters" which are in close relation to another Art called "Wills".