Write the characteristics of good letter?

Question: Write the characteristics of good letter?

Characteristics of a good letter are as follows: 1. There should be a well defined objective. 2. Contact information. 3. Definite structure. 4. The structure or main text of a business letter is typically divided into three sections: the introduction, the body and closing.  description Should be brief. 5.Any  good letter must be short. 6.The tone of the letter is another very important aspect of the letter. 7. The writer has to be optimistic.