You are confusing sales and marketing. They are two different things.
Sales has to do with the actual process of completing a sales transaction. It is the shopping cart and payment part of the process.
Marketing is what you do before and after the sale. It is advertising, promotion, building awareness, customer relationships, product presentation and follow-up after the sale.
The four P's of the marketing mix used to be products (what you sell), pricing (your pricing strategy), place (where the product can be purchased) and promotion (how you build awareness). Some marketers extend this to 6 P's by adding people (how your employees deal with customers) and process (how all of the other 5 P's fit together).
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin