Non official letters a letter

Non official letters
A letter is a written message conveyed from one person (or group of people) to another through a medium.^{[clarification needed][1]} The term usually excludes written material intended to be read in its original form by large numbers of people, such as newspapers and placards; however even these may include material in the form of an "open letter". Letters can be formal or informal. Besides being 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.^[1] Letters have been sent since antiquity and are mentioned in the Iliad.^[2] Historians Herodotus and Thucydides mention and use letters in their writings.^[3]
Historically, letters have existed from, ancient India, ancient Egypt and Sumer, through Rome, Greece and China, up to the present day. During the 17th and 18th centuries, letters were used to self-educate.^{[clarification needed]} The main purposes of letters were to send information, news and greetings. For some, letters were a way to practice critical reading, self-expressive writing, polemical writing and also exchange ideas with like-minded others. For some people, letters were seen as a written performance.^{[clarification needed]} Letters make up several of the books of the Bible. Archives of correspondence, whether for personal, diplomatic, or business reasons, serve as primary sources for historians. At certain times, the writing of letters was thought to be an art form and a genre of literature, for instance in Byzantine epistolography.^[4]
In the ancient world letters might be written on various different materials, including metal, lead, wax-coated wooden tablets, pottery fragments, animal skin, and papyrus. From Ovid, we learn that Acontius used an apple for his letter to Cydippe.^[5] More recently, letters have mainly been written on paper: handwritten and more recently typed.
As communication technology has developed in recent history, posted letters on paper have become less important as a routine form of communication. For example, the development of the telegraph drastically shortened the time taken to send a communication, by sending it between distant points as an electrical signal. At the telegraph office closest to the destination, the signal was converted back into writing on paper and delivered to the recipient. The next step was the telex which avoided the need for local delivery. Then followed the fax (facsimile) machine: a letter could be transferred from the sender to the receiver through the telephone network as an image. These technologies did not displace physical letters as the primary route for communication; however today, the internet, by means of email, plays the main role in written communications, together with text messages; however, these email communications are not generally referred to as letters but rather as e-mail (or email) messages, messages or simply emails or e-mails, with the term "letter" generally being reserved for communications on paper.