A sale is the act of selling a product or service in return for money or other compensation. Signalling completion of the prospective stage, it is the beginning of an engagement between customer and vendor or the extension of that engagement. Sales can take place through various mediums including Direct sales, Agency-based, Door-to-door methods, Request for proposal, Business-to-business, Web, Mail-order, etc.
Marketing and sales differ greatly, but have the same goal. Selling is the final stage in Marketing, which also includes Pricing, Promotion, Positioning and Product (the 4Ps). A marketing department in an organization has the goals of increasing the desirability and value to the customer and increasing the number and engagement of interactions between potential customers and the organization.