Dear applicant, Sales and Marketing are two different concepts of Marketing Management. Sales means in simple words Product Selling, you need to approach the customer to buy your products whereas Marketing means to make the customer aware of your products. You can promote the product to the customer but there is no forcing possibilities, you just want many people to know about your product so that indirectly you can influence them to buy them the product. Marketing is a broad spectrum of management sector, sales is a part of it.

Good luck!!