What is a letter?

A letter is a form of written communication between two persons or two parties on a particular topic, matter, issue, incident, etc. It serves the purpose of documentation as well.

How to Write a Good Letter.

A letter is a direct address to the  addressee. Hence it must be appealing.

The ideas must be original and relevant.

Include your own viewpoints and opinions on the topic only where called for.

Write the letter in simple but correct English.

Choose the most appropriate words, phrases and idiomatic expressions so as to arrive at an effective style.

In official and commercial letters, avoid jargon as far as possible.

On completion of the letter, check whether it reads well as a composite whole.