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To convince someting to own something paying you money which would be value of product or service offered if its a business. If someone tries to convince other party to get something like job would be selling yourself for post to get work.
Sales is an art which makes people believe its an power to convince people to pay for the value what your project to them.
source
http://www.investopedia.com/terms/s/sale.asp
To convince someone to get you offer ,service or product in the reward of money.
Sales for me is the art and science of convincing the customer that the product will satisy his/her need and value proposition is high as compared to competitors product.
Sales means one party is offering any shape of goods or any service in return of something is sales
Dear Mr.Rahim
Sales is the Process wherby you identify needs of customer find a solution to them and recommend or present a product /service to customer or sell directly to the customer in both you do transaction and generate value and thus create a satisfied customer.
sales is a matching between customer needs and your products.
Sales is an art which helps in understanding the clients requirements and to provide best suitable service or a product the matchs the clients needs.