Sales is to the consumer and market is to an industry and it lateral extended business
A sales promotion is usually something that a saleman is able to offer to a client. Usually this is done directly by the saleman to the client via a phone call or personal meeting. Marketing is done...
advertising may be not all for sales, such as Public service ads.but most ads for sales
Marketing is everythig you do to create demand and sales, one of which is sales promotion.
In sales letter you urge consumer while in sales promotion letter you induce the customer.