In the past, it used to send messages to each other. In ancient time, people often use the runner for bringing the news to other people. However, it was notice that it was not really workout or distorted. so that people who wanted to communicate have to write the letters or draw a picture on materials such as stone, wood and bone. According from format, the letter addressed must have a recipient's address on it. And they have to pay fees before sending the letter to the authorities. They are also stick a stamp and dropped into a postbox. Then the letters will be sent to the recipient as the processed which has addressed on them.