NEED FOR MAKING SALE LETTER

 A sales letter is a kind of direct mail which is directly sent by an advertiser to a consumer when there is no salesman. In these days there are so many companies in the market who are in great competition with each other , so they need to make their company on top position by making more customers in the market. Sales letters helps a lot the companies to persuade the customers for buying their products and services. In this way companies need to write sales letter time to time for staying in the market and to chase the companies.

Companies use sales letters to promote their product in the public, because a letter is some like personal thing. People pays more attention on the letters rather than hearing or watching any advertisement. That is why some companies always focus on their letters because only a letter is everything for the company to make it on the top or bottom in the market.
http://en.wikipedia.org/wiki/Sales_letter