1. What is a product? A product refers to anything that can be provided to the market, used and consumed by people, and can meet certain needs of people, including tangible items, intangible services, organizations, concepts or their combinations. Products can generally be divided into three levels, namely core products, form products, and extended products. The core product refers to the direct benefits and utility that the overall product provides to buyers; the formal product refers to the physical appearance of the product in the market, including the product's quality, features, shape, trademark and packaging; the extended product refers to the overall product A series of additional benefits provided to customers, including delivery, installation, maintenance, warranty and other benefits given to consumers in the consumer field.