We break up Sales and Marketing so we can understand the concepts more easily. Sales is everything you do to get the prospect to buy your service or product.
Sales usually involves the prospects actual decision-making process.
Marketing is more strategy than tactics. Marketing involves concepts like price and product. To a great extent Sales and Marketing are not different but just parts of the same thing. The important thing to remember is that Sales and Marketing efforts should be consistent and part of the same overall strategy. Your marketing efforts should support your sales efforts.