Marketing can be defined as a management process that focuses on customer orientation and satisfaction. Basically you inform your target clients about your products and or services, aiming to achieve your companies goals through meeting and exceeding your customers needs better than your competitors.
Every business needs marketing to survive. Owning a good business does not mean anything if a) people do not know about it and b) you do not know how to market it. You could be producing the best product or providing the best service in the world but it would not be a business unless you sell it. Marketing is about how you communicate with your potential customers before selling the product or service you wish them to buy. It starts with understanding your target customers needs and preferences and finding the best way to reach them for the satisfaction of both parts. The ultimate goal is that they buy the product or service they need and you get their hard earned cash.