You know you're doing it but no-one else does. Without marketing and public relations you will have no prospects and without sales, prospects don't turn into customers. So sales, marketing and public relations are crucial roles for any business large or small. It is no good creating a product or setting up a business if you do not market them effectively. So many companies set up in business, invest heavily in the product, product development, and the back office, but forget to leave enough budget to go out and get customers and clients.